Terminate after printing the version number when -V is used.

git-svn-id: svn://svn.cc65.org/cc65/trunk@4110 b7a2c559-68d2-44c3-8de9-860c34a00d81

src/cc65/main.c

@@ -674,6 +674,7 @@ static void OptVersion (const char* Opt attribute ((unused)),
        	     "cc65 V%u.%u.%u\n"
 	     "SVN version: %s\n",
        	     VER_MAJOR, VER_MINOR, VER_PATCH, SVNVersion);
+    exit (EXIT_SUCCESS);
 }