comment in getugroups.c

[Bruno Haible]

This fixes an outdated comment in getugroups.c. getgrent et al. are part
of POSIX/XSI since the Base Specifications Version 5.

*** gnulib-20060430/lib/getugroups.c    2005-09-23 06:15:13.000000000 +0200
--- gnulib-20060430-modified/lib/getugroups.c   2006-05-19 00:46:28.000000000 
+0200
***************
*** 34,41 ****
  # define EOVERFLOW EINVAL
  #endif
  
! /* setgrent, getgrent, and endgrent are not specified by POSIX.1,
!    so header files might not declare them.
     If you don't have them at all, we can't implement this function.
     You lose!  */
  struct group *getgrent ();
--- 34,40 ----
  # define EOVERFLOW EINVAL
  #endif
  
! /* Some old header files might not declare setgrent, getgrent, and endgrent.
     If you don't have them at all, we can't implement this function.
     You lose!  */
  struct group *getgrent ();