Auto merge of #2211 - devnexen:macos_memset_pattern, r=Amanieu

apple adding memset_pattern* flavors

Author: bors

libc-test/semver/apple.txt

@@ -1685,6 +1685,9 @@ mach_timebase_info_data_t
 madvise
 max_align_t
 mcontext_t
+memset_pattern4
+memset_pattern8
+memset_pattern16
 memset_s
 mincore
 mkdirat

src/unix/bsd/apple/mod.rs

@@ -4049,6 +4049,11 @@ extern "C" {
     // Added in macOS 10.13
     // ISO/IEC 9899:2011 ("ISO C11") K.3.7.4.1
     pub fn memset_s(s: *mut ::c_void, smax: ::size_t, c: ::c_int, n: ::size_t) -> ::c_int;
+    // Added in macOS 10.5
+    pub fn memset_pattern4(b: *mut ::c_void, pattern4: *const ::c_void, len: ::size_t);
+    pub fn memset_pattern8(b: *mut ::c_void, pattern8: *const ::c_void, len: ::size_t);
+    pub fn memset_pattern16(b: *mut ::c_void, pattern16: *const ::c_void, len: ::size_t);
+
     pub fn proc_listpids(
         t: u32,
         typeinfo: u32,