feat: deprecate windows time64_t

Functionality related to the Windows `time64_t` has been deprecated in
favor of a single, 64-bit wide `time_t`. This has also required some work
into getting rid of the conditional compilation uses of `time_t` on GNU
target environments, and tweaking the `max_align_t` type.

The `FIXME` comment on the tier 1 platform support for Windows with GNU
has also been removed as no segfaults were observed.

Author: dybucc

libc-test/build.rs

@@ -753,7 +753,6 @@ fn test_cygwin(target: &str) {
 fn test_windows(target: &str) {
     assert!(target.contains("windows"));
     let gnu = target.contains("gnu");
-    let i686 = target.contains("i686");
 
     let mut cfg = ctest_cfg();
 
@@ -818,19 +817,9 @@ fn test_windows(target: &str) {
     cfg.skip_alias(move |alias| match alias.ident() {
         "SSIZE_T" if !gnu => true,
         "ssize_t" if !gnu => true,
-        // FIXME(windows): The size and alignment of this type are incorrect
-        "time_t" if gnu && i686 => true,
         _ => false,
     });
 
-    cfg.skip_struct(move |struct_| {
-        match struct_.ident() {
-            // FIXME(windows): The size and alignment of this struct are incorrect
-            "timespec" if gnu && i686 => true,
-            _ => false,
-        }
-    });
-
     cfg.skip_const(move |constant| {
         match constant.ident() {
             // FIXME(windows): API error:

src/windows/mod.rs

@@ -18,13 +18,7 @@ pub type clock_t = i32;
 
 pub type errno_t = c_int;
 
-cfg_if! {
-    if #[cfg(all(target_arch = "x86", target_env = "gnu"))] {
-        pub type time_t = i32;
-    } else {
-        pub type time_t = i64;
-    }
-}
+pub type time_t = i64;
 
 pub type off_t = i32;
 pub type dev_t = u32;
@@ -34,6 +28,12 @@ extern_ty! {
     pub enum timezone {}
 }
 
+#[deprecated(
+    since = "1.0.0",
+    note = "This time-related value, among others, is part of the shift \
+            towards using a single, 64-bit-sized `time_t`. See #PENDING for \
+            discussion."
+)]
 pub type time64_t = i64;
 
 pub type SOCKET = crate::uintptr_t;