Support mkostemp, mkostemps on Android

Bionic supports it since API level 23. See:

https://github.com/aosp-mirror/platform_bionic/blob/2215ad406b253f12e270cdd0876e19e9df2aa6d4/libc/include/stdlib.h

(apply <#3601> to `main`)
[ update to use new prelude, as is needed since the switch to the new
  edition - Trevor ]
(cherry picked from commit efff8c7)

Author: pcc

src/unix/linux_like/emscripten/mod.rs

@@ -1512,8 +1512,6 @@ extern "C" {
     pub fn pwritev(fd: c_int, iov: *const crate::iovec, iovcnt: c_int, offset: off_t) -> ssize_t;
     pub fn preadv(fd: c_int, iov: *const crate::iovec, iovcnt: c_int, offset: off_t) -> ssize_t;
     pub fn dup3(oldfd: c_int, newfd: c_int, flags: c_int) -> c_int;
-    pub fn mkostemp(template: *mut c_char, flags: c_int) -> c_int;
-    pub fn mkostemps(template: *mut c_char, suffixlen: c_int, flags: c_int) -> c_int;
     pub fn nl_langinfo_l(item: crate::nl_item, locale: crate::locale_t) -> *mut c_char;
     pub fn accept4(
         fd: c_int,

src/unix/linux_like/linux/mod.rs

@@ -6372,8 +6372,6 @@ extern "C" {
         sigmask: *const crate::sigset_t,
     ) -> c_int;
     pub fn dup3(oldfd: c_int, newfd: c_int, flags: c_int) -> c_int;
-    pub fn mkostemp(template: *mut c_char, flags: c_int) -> c_int;
-    pub fn mkostemps(template: *mut c_char, suffixlen: c_int, flags: c_int) -> c_int;
     pub fn sigtimedwait(
         set: *const sigset_t,
         info: *mut siginfo_t,

src/unix/linux_like/mod.rs

@@ -1886,6 +1886,9 @@ extern "C" {
     ) -> size_t;
     pub fn strptime(s: *const c_char, format: *const c_char, tm: *mut crate::tm) -> *mut c_char;
 
+    pub fn mkostemp(template: *mut c_char, flags: c_int) -> c_int;
+    pub fn mkostemps(template: *mut c_char, suffixlen: c_int, flags: c_int) -> c_int;
+
     pub fn getdomainname(name: *mut c_char, len: size_t) -> c_int;
     pub fn setdomainname(name: *const c_char, len: size_t) -> c_int;
 }