SDL_image: update for warning flags in watcom makefile.

From b42848406b230666e399ca620427cb0c5f7aa69d Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Wed, 29 Dec 2021 23:55:24 +0300
Subject: [PATCH] update for warning flags in watcom makefile.

---
 Makefile.os2 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Makefile.os2 b/Makefile.os2
index 69e283f..7f357de 100644
--- a/Makefile.os2
+++ b/Makefile.os2
@@ -26,6 +26,8 @@ LIBS = libpng.lib libtiff.lib zlib.lib jpeg.lib webpdec.lib SDL2.lib
 CFLAGS_BASE = -bt=os2 -ei -d0 -q -5s -fp5 -fpi87 -sg -s -oilrtfm
 # warnings:
 CFLAGS_BASE+= -wx -wcd=202
+# newer OpenWatcom versions enable W303 by default
+CFLAGS_BASE+= -wcd=303
 # include paths:
 CFLAGS_BASE+= -I"$(%WATCOM)/h/os2" -I"$(%WATCOM)/h"
 CFLAGS_BASE+= -I. $(DEPS_INC)