update sdl to 2.32.6

Engine/lib/sdl/visualtest/configure.ac

@@ -0,0 +1,41 @@
+dnl Process this file with autoconf to produce a configure script.
+AC_INIT
+AC_CONFIG_SRCDIR([unittest/testquit.c])
+
+dnl Detect the canonical build and host environments
+AC_CONFIG_AUX_DIR([../build-scripts])
+AC_CANONICAL_HOST
+
+dnl Check for tools
+AC_PROG_CC
+
+dnl Figure out which math or extra library to use
+case "$host" in
+    *-*-cygwin* | *-*-mingw*)
+        EXE=".exe"
+        EXTRALIB="-lshlwapi"
+        ;;
+    *)
+        EXE=""
+        EXTRALIB=""
+        ;;
+esac
+AC_SUBST(EXE)
+
+dnl Check for SDL
+SDL_VERSION=2.0.0
+AM_PATH_SDL2($SDL_VERSION,
+            :,
+	    AC_MSG_ERROR([*** SDL version $SDL_VERSION not found!])
+)
+CFLAGS="$CFLAGS $SDL_CFLAGS"
+LIBS="$LIBS -lSDL2_test $SDL_LIBS $EXTRALIB"
+
+PKG_CHECK_MODULES(LIBUNWIND, libunwind, have_libunwind=yes, have_libunwind=no)
+if test x$have_libunwind = xyes ; then
+   LIBS="$LIBS $LIBUNWIND_LIBS"
+fi
+
+dnl Finally create all the generated files
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT