c linker: pass -Xlinker -z -Xlinker muldefs only on Linux with -cache

vlib/v/builder/cc.v

@@ -317,7 +317,9 @@ fn (v mut Builder) cc() {
 			}
 		}
 		if !is_cc_tcc {
-			a << '-Xlinker -z -Xlinker muldefs'
+			$if linux {
+				a << '-Xlinker -z -Xlinker muldefs'
+			}
 		}
 	}