Do not overwrite Redox S_IS constants

Author: jackpot51

src/unix/redox/mod.rs

@@ -427,9 +427,6 @@ pub const S_IRWXO: ::c_int = 0o0_007;
 pub const S_IROTH: ::c_int = 0o0_004;
 pub const S_IWOTH: ::c_int = 0o0_002;
 pub const S_IXOTH: ::c_int = 0o0_001;
-pub const S_ISUID: ::c_int = 0o4_000;
-pub const S_ISGID: ::c_int = 0o2_000;
-pub const S_ISVTX: ::c_int = 0o1_000;
 
 // stdlib.h
 pub const EXIT_SUCCESS: ::c_int = 0;