security/mit-krb5 breaks other kerberos-using packages

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

As noted here:

  http://mail-index.NetBSD.org/pkgsrc-users/2016/09/21/msg023779.html

"net/wireshark" v2.2.0 in pkgsrc-HEAD (soon to be pkgsrc-2016Q3) requires
"security/mit-krb5" and installs it as a dependency.

Once installed, other kerberos-using packages break when their "./configure"
script picks up "/usr/pkg/bin/krb5-config" and subsequently fail to
link.

Example from "print/cups":

[...]
ld: cannot find -lgssapi_krb5
ld: cannot find -lk5crypto
Makefile:232: recipe for target 'ippserver' failed
gmake[1]: *** [ippserver] Error 1
gmake[1]: *** Waiting for unfinished jobs....
Makefile:31: recipe for target 'all' failed
gmake: *** [all] Error 1
*** Error code 2

Stop.
make[1]: stopped in /x/pkgsrc/print/cups
*** Error code 1

Stop.
make: stopped in /x/pkgsrc/print/cups


Fortunately, "print/cups" can have kerberos support disabled to work
around the problem.  Others, such as "chat/loudmouth" do not currently
have an explicit dependency on kerberos and thus fail similarly.  One
must explicitly include "../../security/mit-krb5/buildlink3.mk" to get
"loudmouth" to build on a system with "mit-krb5" installed.

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