Auto merge of #2303 - devnexen:mac_getenviron_env, r=JohnTitor

apple as _NSGetEnviron

Author: bors

libc-test/build.rs

@@ -175,6 +175,7 @@ fn test_apple(target: &str) {
         "aio.h",
         "CommonCrypto/CommonCrypto.h",
         "CommonCrypto/CommonRandom.h",
+        "crt_externs.h",
         "ctype.h",
         "dirent.h",
         "dlfcn.h",

libc-test/semver/apple.txt

@@ -1444,6 +1444,7 @@ YESSTR
 _IOFBF
 _IOLBF
 _IONBF
+_NSGetEnviron
 _NSGetExecutablePath
 _POSIX_VDISABLE
 _PTHREAD_COND_SIG_init

src/unix/bsd/apple/mod.rs

@@ -4416,6 +4416,7 @@ extern "C" {
     pub fn CCRandomGenerateBytes(bytes: *mut ::c_void, size: ::size_t) -> ::CCRNGStatus;
 
     pub fn _NSGetExecutablePath(buf: *mut ::c_char, bufsize: *mut u32) -> ::c_int;
+    pub fn _NSGetEnviron() -> *mut *mut *mut ::c_char;
 
     pub fn mach_vm_map(
         target_task: ::vm_map_t,