Update to SDL 2.30.5

SDL2-2.30.5/autogen.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+set -e
+
+echo "Generating build information using autoconf"
+echo "This may take a while ..."
+
+srcdir=`dirname $0`
+test -z "$srcdir" && srcdir=.
+cd "$srcdir"
+
+# Regenerate configuration files
+cat acinclude/* >aclocal.m4
+
+"${AUTOCONF:-autoconf}"
+rm aclocal.m4
+rm -rf autom4te.cache
+
+(cd test; sh autogen.sh)
+
+echo "Now you are ready to run ./configure"