krb5/util contains both programs and libraries; trying to build that
for compat confuses bsd.prog.mk and results in unwanted files being
created in the source tree. Remove krb5/util and instead list only
the directories underneath krb5/util which contain libraries.

While here, add krb5/libdata so that we install 32-bit versions of
the pkgconfig data which were previously missing.

Fixes: fb13ae28b2e8 ("Makefile.libcompat: Add krb5/util")