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
3056dcdb78