eliminate export function struct workaround for timespec

src/header/bits_timespec/cbindgen.toml

@@ -1,7 +1,6 @@
 # POSIX header spec: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/time.h.html
 #
-# The time header should define timespec but multiple headers make use of it.
-# This type is split out from the time header to avoid including all of time in the other headers.
+# This type is split out to avoid including all of time.h in the other headers.
 #
 # POSIX headers that require timespec:
 # - aio.h (all functions currently unimplemented but timespec imported)
@@ -24,3 +23,6 @@ cpp_compat = true
 
 [enum]
 prefix_with_name = true
+
+[export]
+include = ["timespec"]

src/header/bits_timespec/mod.rs

@@ -4,6 +4,7 @@ use crate::{
 };
 
 /// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/time.h.html>.
+#[allow(non_camel_case_types)]
 #[repr(C)]
 #[derive(Clone, Default, Debug)]
 pub struct timespec {
@@ -79,6 +80,3 @@ impl<'a> From<&'a timespec> for syscall::TimeSpec {
         }
     }
 }
-
-#[unsafe(no_mangle)]
-pub unsafe extern "C" fn cbindgen_stupid_alias_timespec(_: timespec) {}