support c99 for-loop init decls

tests/Makefile

@@ -42,7 +42,7 @@ libtcc_test$(EXESUF): libtcc_test.c ../$(LIBTCC)
 # copy only tcclib.h so GCC's stddef and stdarg will be used
 test.ref: tcctest.c
 	cp -u ../include/tcclib.h .
-	$(CC) -o tcctest.gcc $< -I. -w $(CFLAGS)
+	$(CC) -o tcctest.gcc $< -I. -w $(CFLAGS) -std=gnu99
 	./tcctest.gcc > $@
 
 # auto test

tests/tcctest.c

@@ -387,6 +387,10 @@ void loop_test()
     } while (i < 10);
     printf("\n");
 
+    /* c99 for loop init test */
+    for (size_t count = 1; count < 3; count++)
+        printf("count=%d\n", count);
+
     /* break/continue tests */
     i = 0;
     while (1) {