Fix warnings

This change fixes Cosmopolitan so it has fewer opinions about compiler
warnings. The whole repository had to be cleaned up to be buildable in
-Werror -Wall mode. This lets us benefit from things like strict const
checking. Some actual bugs might have been caught too.

third_party/quickjs/str.c

@@ -22,11 +22,11 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
+#include "libc/str/str.h"
 #include "libc/assert.h"
 #include "libc/fmt/conv.h"
 #include "libc/fmt/fmt.h"
 #include "libc/runtime/fenv.h"
-#include "libc/str/str.h"
 #include "third_party/gdtoa/gdtoa.h"
 #include "third_party/quickjs/internal.h"
 #include "third_party/quickjs/libregexp.h"
@@ -859,12 +859,6 @@ static int js_string_delete_property(JSContext *ctx,
     return TRUE;
 }
 
-static const JSClassExoticMethods js_string_exotic_methods = {
-    .get_own_property = js_string_get_own_property,
-    .define_own_property = js_string_define_own_property,
-    .delete_property = js_string_delete_property,
-};
-
 JSValue js_string_constructor(JSContext *ctx, JSValueConst new_target,
                               int argc, JSValueConst *argv)
 {