rename svn revision variable to one with underscore, to not pollute

application namespace

kernel/main.c

@@ -179,8 +179,8 @@ PRIVATE void announce(void)
 {
   /* Display the MINIX startup banner. */
   kprintf("\nMINIX %s.%s. "
-#ifdef SVN_REVISION
-	"(" SVN_REVISION ")\n"
+#ifdef _SVN_REVISION
+	"(" _SVN_REVISION ")\n"
 #endif
       "Copyright 2006, Vrije Universiteit, Amsterdam, The Netherlands\n",
       OS_RELEASE, OS_VERSION);

tools/release.sh

@@ -287,8 +287,8 @@ then
 	echo "
 
 /* Added by release script  */
-#ifndef SVN_REVISION
-#define SVN_REVISION \"$REVISION\"
+#ifndef _SVN_REVISION
+#define _SVN_REVISION \"$REVISION\"
 #endif" >>$RELEASEDIR/usr/src/include/minix/sys_config.h
 
 else