configure.in: Add checking for SIZEOF_SHORT, SIZEOF_INT, and

configure.in: Add checking for SIZEOF_SHORT, SIZEOF_INT, and
      SIZEOF_LONG, so we don't need to depend on getting this
      information from include/krb5/autoconf.h

gssapi.h: Removed dependence on krb5 include files.

gssapiP_generic.h: We need to include k5-config in order to get
      Windows specific hackery.  Somewhat of a wart, but this is a
      gssapi internal header file, so the rest of the world doesn't
      have to see this.

util_token.c: Define VALID_INT, instead of relying on this being
      defined by krb5.h.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@5388 dc483132-0cff-0310-8789-dd5450dbe970