dontdiff: add utsrelease.h

Add auto-generated utsrelease.h to dontdiff file.
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Documentation/dontdiff

@@ -135,6 +135,7 @@ tags
 times.h*
 tkparse
 trix_boot.h
+utsrelease.h*
 version.h*
 vmlinux
 vmlinux-*