Remove 'grp' and merge into 'nss' and 'posix'

The majority of grp routines are entry points for nss functionality.
This commit removes the 'grp' subdirectory and moves all nss-relevant
functionality and all tests to 'nss', and the 'setgroups' stub into
'posix' (alongside the 'getgroups' stub).  References to grp/ are
accordingly changed.  In addition, compat-initgroups.c, a fallback
implementation of initgroups is renamed to initgroups-fallback.c so that
the build system does not confuse it for nss_compat/compat-initgroups.c.

Build time improves very slightly; e.g. down from an average of 45.5s to
44.5s on an 8-thread mobile x86_64 CPU.
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/posix/Versions b/posix/Versions
index 3753810864..2eedbc3e79 100644
--- a/posix/Versions
+++ b/posix/Versions
@@ -53,7 +53,7 @@ libc {
     sched_get_priority_max; sched_get_priority_min; sched_getparam;
     sched_getscheduler; sched_rr_get_interval; sched_setparam;
     sched_setscheduler; sched_yield; setegid; seteuid; setgid;
-    setpgid; setpgrp; setsid; setuid; sleep; sysconf;
+    setgroups; setpgid; setpgrp; setsid; setuid; sleep; sysconf;
 
     # t*
     times;