Auto merge of #2270 - devnexen:apple_malloc_printf, r=Amanieu

apple add malloc_printf

Author: bors

libc-test/semver/apple.txt

@@ -1693,6 +1693,7 @@ mach_timebase_info
 mach_timebase_info_data_t
 madvise
 malloc_default_zone
+malloc_printf
 malloc_statistics_t
 malloc_zone_calloc
 malloc_zone_check

src/unix/bsd/apple/mod.rs

@@ -4115,6 +4115,7 @@ extern "C" {
     pub fn memset_pattern16(b: *mut ::c_void, pattern16: *const ::c_void, len: ::size_t);
 
     pub fn mstats() -> mstats;
+    pub fn malloc_printf(format: *const ::c_char, ...);
     pub fn malloc_zone_check(zone: *mut ::malloc_zone_t) -> ::boolean_t;
     pub fn malloc_zone_print(zone: *mut ::malloc_zone_t, verbose: ::boolean_t);
     pub fn malloc_zone_statistics(zone: *mut ::malloc_zone_t, stats: *mut malloc_statistics_t);