Make the current revision number available

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403444

build-scripts/updaterev.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+#
+# Generate a header file with the current source revision
+
+cd `dirname $0`
+srcdir=..
+header=$srcdir/include/SDL_revision.h
+
+rev=`sh showrev.sh`
+if [ "$rev" != "" ]; then
+    echo "#define SDL_REVISION $rev" >$header.new
+    if diff $header $header.new >/dev/null 2>&1; then
+        rm $header.new
+    else
+        mv $header.new $header
+    fi
+fi