feat: more _PC_XXX constants for apple targets#3649

JohnTitor merged 1 commit intorust-lang:libc-0.2rust-lang/libc:libc-0.2from

SteveLauC:feat/_PC_XXX_for_apple_0.2SteveLauC/libc:feat/_PC_XXX_for_apple_0.2Copy head branch name to clipboard