tools: hide tcc warning on macos for now

cmd/tools/detect_tcc.v

@@ -4,6 +4,7 @@ fn main() {
 		exit(0)
 	}
 
+	$if !macos {
 		println('
 Note: `tcc` was not used, so unless you install it yourself, your backend
 C compiler will be `cc`, which is usually either `clang`, `gcc` or `msvc`.
@@ -13,3 +14,4 @@ compared to `tcc`. They do produce more optimised executables, but that
 is done at the cost of compilation speed.
 ')
 	}
+}