SDL: Makefile.in: added missing CXX variable.

From 64c7896f09279d73c1199b164c062cf7c1bbbdd8 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Wed, 6 Apr 2022 20:56:10 +0300
Subject: [PATCH] Makefile.in: added missing CXX variable.

---
 Makefile.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile.in b/Makefile.in
index 81c56fd3a83..69f5cb1e2f9 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -19,6 +19,7 @@ distfile = $(distdir).tar.gz
 @SET_MAKE@
 SHELL	= @SHELL@
 CC      = @CC@
+CXX     = @CXX@
 INCLUDE = @INCLUDE@
 CFLAGS  = @BUILD_CFLAGS@
 EXTRA_CFLAGS = @EXTRA_CFLAGS@