Cygwin: internal_getlogin: always call internal_getgroups

Commit 29b7313 ("* cygheap.h (enum cygheap_pwdgrp::cache_t):
Remove.") changed an initial conditional to skip calling
internal_getgroups() if we're running with cygserver account caching
in place.  This breaks changing the primary group.

Unfortunately the commit message doesn't explain why the change was
made.

Just calling internal_getgroups() all the time fixes this behaviour.

Fixes: 29b7313 ("* cygheap.h (enum cygheap_pwdgrp::cache_t): Remove.")
Addresses: https://cygwin.com/pipermail/cygwin/2026-January/259250.html
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
(cherry picked from commit 169a760)

Author: github-cygwin

winsup/cygwin/release/3.6.7

@@ -3,3 +3,7 @@ Fixes:
 
 - Guard c32rtomb against invalid input characters.
   Addresses a testsuite error in current gawk git master.
+
+- Allow changing primary group even when running with cygserver account
+  caching.
+  Addresses: https://cygwin.com/pipermail/cygwin/2026-January/259250.html

winsup/cygwin/uinfo.cc

@@ -153,8 +153,7 @@ internal_getlogin (cygheap_user &user)
      and the primary group in the token. */
   pwd = internal_getpwsid (user.sid (), &cldap);
   pgrp = internal_getgrsid (user.groups.pgsid, &cldap);
-  if (!cygheap->pg.nss_cygserver_caching ())
-    internal_getgroups (0, NULL, &cldap);
+  internal_getgroups (0, NULL, &cldap);
   if (!pwd)
     debug_printf ("user not found in passwd DB");
   else