kbuild: fix mkspec to cleanup RPM_BUILD_ROOT

The contents of the %clean section in mkspec is currently commented
out leaving RPM_BUILD_ROOT and its contents on the build machine.
This patch removes it once the rpm build process is complete.

Signed-off-by: Josh Hunt <josh@scalex86.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/package/mkspec b/scripts/package/mkspec
index ee448cd..3d93f8c 100755
--- a/scripts/package/mkspec
+++ b/scripts/package/mkspec
@@ -96,7 +96,7 @@
 
 echo ""
 echo "%clean"
-echo '#echo -rf $RPM_BUILD_ROOT'
+echo 'rm -rf $RPM_BUILD_ROOT'
 echo ""
 echo "%files"
 echo '%defattr (-, root, root)'