apple: add O_EXEC and O_SEARCH

Author: TheJonny

src/unix/bsd/apple/mod.rs

@@ -3166,6 +3166,8 @@ pub const O_SYMLINK: ::c_int = 0x00200000;
 pub const O_DSYNC: ::c_int = 0x00400000;
 pub const O_CLOEXEC: ::c_int = 0x01000000;
 pub const O_NOFOLLOW_ANY: ::c_int = 0x20000000;
+pub const O_EXEC: ::c_int = 0x40000000;
+pub const O_SEARCH: ::c_int = O_EXEC | O_DIRECTORY;
 pub const S_IFIFO: mode_t = 4096;
 pub const S_IFCHR: mode_t = 8192;
 pub const S_IFBLK: mode_t = 24576;