[Makefile] Add "+" to end of version string for git-generated images
-rw-r--r-- 17982 COPYING
-rw-r--r-- 908 COPYRIGHTS
-rw-r--r-- 342 LOG
-rw-r--r-- 1650 README
-rw-r--r-- 17 VERSION
drwxr-xr-x - contrib
drwxr-xr-x - src