misc/groups-dash fails due to enable-no-install-program=groups

[Mike Frysinger]

it's been a while, so i dont remember if this has been reported already, but 
if groups is disabled via the command line, the misc/groups-dash test is still 
run.  since the groups program is not coming from coreutils, the output is not 
as expected and things fail.  perhaps a new func in test-lib.sh like:
require_program_()
{
  test -x "$abs_top_builddir/src/$1" || \
    skip_test_ "the $1 program was disabled"
}
and then the groups test can do:
require_program_ groups
-mike

signature.asc
Description: This is a digitally signed message part.