r15217 apparently intended to prune $(CFLAGS) from the --libs output,
but actually substituted in the value from the invoker's environment.
Actually prune it.

Don't output external dependencies like -lresolv or -ldl in
krb5-config --libs.  We already don't generate output suitable for
static linking because we omit -lkrb5support, and there is no
expectation that bringing in the krb5 API also brings in the resolv or
dl APIs for the application.

We still output internal dependencies and a com_err dependency; for
instance, e.g. krb5-config --libs gssapi outputs a dependency on -lkrb5
and -lk5crypto, which is inappropriate for a program using only GSSAPI
interfaces.  Removing internal dependencies would likely break callers
who have come to depend on them, especially as we've never correctly
supported things like "krb5-config --libs gssapi krb5" for a program
using multiple APIs.

From stephane@archlinux.org with changes.

https://github.com/krb5/krb5/commit/39e6f17626a138f2e22baa9bed718e4ee9ddf025
Commit By: ghudson
Revision: 25236
Changed Files:
U   trunk/src/krb5-config.in