Fix the types of 'struct stat'/'stat stat64' fields 'st_*tim'.

(backport <#4597>)
(cherry picked from commit cf82fdf)

Author: xingxue-ibm

libc-test/build.rs

@@ -5736,6 +5736,16 @@ fn test_aix(target: &str) {
             // header does not define a separate standalone union type for it.
             ("ld_info", "_file") => true,
 
+            // On AIX, when _ALL_SOURCE is defined, the types of the following fields
+            // differ from those used when _XOPEN_SOURCE is defined. The former uses
+            // 'struct st_timespec', while the latter uses 'struct timespec'.
+            ("stat", "st_atim") => true,
+            ("stat", "st_mtim") => true,
+            ("stat", "st_ctim") => true,
+            ("stat64", "st_atim") => true,
+            ("stat64", "st_mtim") => true,
+            ("stat64", "st_ctim") => true,
+
             _ => false,
         }
     });

src/unix/aix/mod.rs

@@ -463,9 +463,9 @@ s! {
         pub st_gid: crate::gid_t,
         pub st_rdev: dev_t,
         pub st_ssize: c_int,
-        pub st_atim: st_timespec,
-        pub st_mtim: st_timespec,
-        pub st_ctim: st_timespec,
+        pub st_atim: crate::timespec,
+        pub st_mtim: crate::timespec,
+        pub st_ctim: crate::timespec,
         pub st_blksize: blksize_t,
         pub st_blocks: blkcnt_t,
         pub st_vfstype: c_int,

src/unix/aix/powerpc64.rs

@@ -69,9 +69,9 @@ s! {
         pub st_gid: crate::gid_t,
         pub st_rdev: crate::dev_t,
         pub st_ssize: c_int,
-        pub st_atim: crate::st_timespec,
-        pub st_mtim: crate::st_timespec,
-        pub st_ctim: crate::st_timespec,
+        pub st_atim: crate::timespec,
+        pub st_mtim: crate::timespec,
+        pub st_ctim: crate::timespec,
         pub st_blksize: crate::blksize_t,
         pub st_blocks: crate::blkcnt_t,
         pub st_vfstype: c_int,