mkvers.c - remove afsconfig.h, afs/param.h and assert.h

mkvers.c - remove afsconfig.h, afs/param.h and assert.h

assert() is not used within mkvers.c.

afsconfig.h and afs/param.h have dependency problems in
src/config/

Change-Id: I2012a01c87cbd993a70df76ee3384b43ff037b29
Reviewed-on: http://gerrit.openafs.org/2203
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Tested-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>