Allow new unpredictable_function_pointer_comparisons lints

These appeared in a recent nightly from our `PartialEq` derives. Add
`allow`s where needed to suppress them, since removing the derive would
be breaking.

(backport <#4489>)
[ applied to PSP as well - Trevor ]
(cherry picked from commit e637810)

Author: tgross35

src/fuchsia/mod.rs

@@ -292,6 +292,8 @@ s! {
         __dummy4: [c_char; 16],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,

src/psp.rs

@@ -1415,6 +1415,8 @@ s! {
         pub stack: [u32; 8],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct GeCallbackData {
         pub signal_func: Option<extern "C" fn(id: i32, arg: *mut c_void)>,
         pub signal_arg: *mut c_void,
@@ -1537,6 +1539,8 @@ s! {
         pub stack_mpid: SceUid,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct SceKernelThreadInfo {
         pub size: usize,
         pub name: [u8; 32],
@@ -1611,6 +1615,8 @@ s! {
         pub first_message: *mut c_void,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct SceKernelVTimerInfo {
         pub size: usize,
         pub name: [u8; 32],
@@ -1622,6 +1628,8 @@ s! {
         pub common: *mut c_void,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct SceKernelThreadEventHandlerInfo {
         pub size: usize,
         pub name: [u8; 32],
@@ -1631,6 +1639,8 @@ s! {
         pub common: *mut c_void,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct SceKernelAlarmInfo {
         pub size: usize,
         pub schedule: SceKernelSysClock,
@@ -1688,6 +1698,8 @@ s! {
         pub size: usize,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct SceKernelCallbackInfo {
         pub size: usize,
         pub name: [u8; 32usize],
@@ -1787,6 +1799,8 @@ s! {
         pub type_: UmdType,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct SceMpegRingbuffer {
         pub packets: i32,
         pub unk0: u32,

src/unix/bsd/apple/b64/x86_64/mod.rs

@@ -109,6 +109,8 @@ s! {
         _private: [crate::uintptr_t; 16], // FIXME(macos): keeping private for now
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct malloc_zone_t {
         _reserved1: *mut c_void,
         _reserved2: *mut c_void,

src/unix/bsd/freebsdlike/dragonfly/mod.rs

@@ -520,6 +520,8 @@ s_no_extra_traits! {
         pub mc_fpregs: [[c_uint; 8]; 32],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct ucontext_t {
         pub uc_sigmask: crate::sigset_t,
         pub uc_mcontext: mcontext_t,

src/unix/cygwin/mod.rs

@@ -351,6 +351,8 @@ s! {
         pub cr2: u64,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigevent {
         pub sigev_value: sigval,
         pub sigev_signo: c_int,

src/unix/haiku/native.rs

@@ -403,11 +403,14 @@ s! {
     }
 
     // kernel/image.h
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct image_info {
         pub id: image_id,
         pub image_type: c_int,
         pub sequence: i32,
         pub init_order: i32,
+        // FIXME(1.0): these should be made optional
         pub init_routine: extern "C" fn(),
         pub term_routine: extern "C" fn(),
         pub device: crate::dev_t,

src/unix/linux_like/android/b32/mod.rs

@@ -12,6 +12,8 @@ pub type __u64 = c_ulonglong;
 pub type __s64 = c_longlong;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,

src/unix/linux_like/android/b64/mod.rs

@@ -12,6 +12,8 @@ s! {
         __val: [c_ulong; 1],
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_flags: c_int,
         pub sa_sigaction: crate::sighandler_t,

src/unix/linux_like/emscripten/mod.rs

@@ -158,6 +158,8 @@ s! {
         pub sem_flg: c_short,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,

src/unix/linux_like/linux/gnu/b32/arm/mod.rs

@@ -4,6 +4,8 @@ use crate::{off64_t, off_t};
 pub type wchar_t = u32;
 
 s! {
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         pub sa_sigaction: crate::sighandler_t,
         pub sa_mask: crate::sigset_t,