netbsd update.

ucontext_t/mcontext_t exposure on x86_64 architecture.

Author: devnexen

libc-test/build.rs

@@ -939,6 +939,7 @@ fn test_netbsd(target: &str) {
         "sys/time.h",
         "sys/times.h",
         "sys/timex.h",
+        "sys/ucontext.h",
         "sys/uio.h",
         "sys/un.h",
         "sys/utsname.h",

src/unix/bsd/netbsdlike/netbsd/x86_64.rs

@@ -3,8 +3,26 @@ use PT_FIRSTMACH;
 pub type c_long = i64;
 pub type c_ulong = u64;
 pub type c_char = i8;
+pub type c___greg_t = u64;
 pub type __cpu_simple_lock_nv_t = ::c_uchar;
 
+s! {
+    #[repr(align(16))]
+    pub struct mcontext_t {
+        pub __gregs: [c___greg_t; 26],
+        pub _mc_tlsbase: c___greg_t,
+        pub __fpregs: [[::c_char;32]; 16],
+    }
+
+    pub struct ucontext_t {
+        pub uc_flags: ::c_uint,
+        pub uc_link: *mut ::ucontext_t,
+        pub uc_sigmask: ::sigset_t,
+        pub uc_stack: ::stack_t,
+        pub uc_mcontext: ::mcontext_t,
+    }
+}
+
 // should be pub(crate), but that requires Rust 1.18.0
 cfg_if! {
     if #[cfg(libc_const_size_of)] {