r4963: It is actually a very bad idea to use KRB5_CONFIG in the

r4963: It is actually a very bad idea to use KRB5_CONFIG in the
configure-checks (At least Heimdal uses KRB5_CONFIG for locating it's
configuration-file (usually /etc/krb5.conf)). Renaming it to KRB5CONFIG
prevents configure-checks that use heimdal-libs from segfaulting while
the lib reads the krb5-config binary as a configuration file...

Vendors that used the KRB5_CONFIG-variable to let configure find a
custom krb5-config binary have to use KRB5CONFIG now.

Guenther
(This used to be commit 95edb3c67f330afd8dbb8268f3f8ecaf1732c238)