Ifdefs, moved semantic to check, fixed error reporting for builtins

test/if_def_expression.ink

@@ -0,0 +1,13 @@
+//#add_define PS5
+#add_define XSX
+//#add_define Switch2
+
+#if (Env.PS5 && Env.XSX) || Env.Switch2 {
+	vertex console_main :: () {
+
+	}
+} else {
+	vertex windows_main :: () {
+
+	}
+}