The aux_cache fix of bug 11149 introduced a new bug - normally,
ldconfig -r never cares if the auxiliary cache is not available and
that is not a fatal problem, however this is not the case in case
of ldconfig -r when executed as non-root. In that case, ldconfig -r
fails hard unless var/cache/ldconfig/ exists within the chroot. This
patch fixes that.

Conflicts:

	ChangeLog
(cherry picked from commit 6db52fbb272979bdcd5d5dd7ab187e1893eda9e3)

Compat initgroups() is completely broken; the code will always set
skip_initgroups_dyn to true, so initgroups() will never be actually
called, but due to the nature of the code, setgrent() won't be called
either - thus, subsequent invocations of initgroups() will not return
the NIS group list anymore.

This is a simple patch that makes sure skip_initgroups_dyn is set only
in case initgroups is not available; it also attempts to handle the
unavailability of other NSS interfaces better.

Conflicts:

	ChangeLog
(cherry picked from commit 3056dcdb783a177158a5617657d1a33f872358d6)

Required for flawless make dist run.

(cherry picked from commit c21cc9bcb38a87ff638d1099ca871d94a2192b31)

(cherry picked from commit cf7c9078a5acdbb435498ace92cd81009637a971)

(cherry picked from commit a1fb5e3ebe9d38b5ae6c5bfbfaa04882d52355bc)

(cherry picked from commit 3540d66b669af54900b2e4bfc0ab82960e84a471)