Prefix jsc callbacks with `function_`

This marks them as jsc callbacks for us, which we can later grep for,
and possibly do more stuff with.

c/jsc-test.c

JSStringRef to_string(JSContextRef ctx, JSValueRef val);
JSValueRef console_log(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception) {
JSValueRef function_console_log(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception) {
	for (int i = 0; i < argumentCount; i++) {
		if (i > 0) {
			fprintf(stdout, " ");
	return JSValueMakeUndefined(ctx);
}
JSValueRef console_error(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception) {
JSValueRef function_console_error(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception) {
	for (int i = 0; i < argumentCount; i++) {
		if (i > 0) {
			fprintf(stderr, " ");
	JSObjectRef global_obj = JSContextGetGlobalObject(ctx);
	register_global_function(ctx, "CONSOLE_LOG", console_log);
	register_global_function(ctx, "CONSOLE_ERROR", console_error);
	register_global_function(ctx, "CONSOLE_LOG", function_console_log);
	register_global_function(ctx, "CONSOLE_ERROR", function_console_error);
	JSStringRef init_source = JSStringCreateWithUTF8CString("<init>");
	JSStringRef init_script = JSStringCreateWithUTF8CString("var console = {};"\