Add FIONREAD for apple/b64
@@ -17,3 +17,5 @@ pub const __PTHREAD_RWLOCK_SIZE__: usize = 192;
pub const TIOCTIMESTAMP: ::c_ulong = 0x40107459;
pub const TIOCDCDTIMESTAMP: ::c_ulong = 0x40107458;
+
+pub const FIONREAD: ::c_ulong = 0x4004667f;
