gnu powerpc: Use a separate stat struct for powerpc

Like mips, the stat struct will become different once support for
gnu_file_offset_bits64 is added.

Author: snogge

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

@@ -51,7 +51,11 @@ cfg_if! {
 }
 
 cfg_if! {
-    if #[cfg(not(any(target_arch = "mips", target_arch = "mips32r6")))] {
+    if #[cfg(not(any(
+        target_arch = "mips",
+        target_arch = "mips32r6",
+        target_arch = "powerpc"
+    )))] {
         s! {
             pub struct stat {
                 pub st_dev: crate::dev_t,

src/unix/linux_like/linux/gnu/b32/powerpc.rs

@@ -57,6 +57,28 @@ s! {
         __glibc_reserved2: u64,
     }
 
+    pub struct stat {
+        pub st_dev: crate::dev_t,
+        pub st_ino: crate::ino_t,
+        pub st_mode: crate::mode_t,
+        pub st_nlink: crate::nlink_t,
+        pub st_uid: crate::uid_t,
+        pub st_gid: crate::gid_t,
+        pub st_rdev: crate::dev_t,
+        __pad2: c_ushort,
+        pub st_size: off_t,
+        pub st_blksize: crate::blksize_t,
+        pub st_blocks: crate::blkcnt_t,
+        pub st_atime: crate::time_t,
+        pub st_atime_nsec: c_long,
+        pub st_mtime: crate::time_t,
+        pub st_mtime_nsec: c_long,
+        pub st_ctime: crate::time_t,
+        pub st_ctime_nsec: c_long,
+        __glibc_reserved4: c_ulong,
+        __glibc_reserved5: c_ulong,
+    }
+
     pub struct stat64 {
         pub st_dev: crate::dev_t,
         pub st_ino: crate::ino64_t,