gpo_child: don't include 'util/signal.c'

It's not really needed.

Reviewed-by: Sumit Bose <sbose@redhat.com>
Reviewed-by: Tomáš Halman <thalman@redhat.com>
(cherry picked from commit 488e540)

Reviewed-by: Tomáš Halman <thalman@redhat.com>
(cherry picked from commit 67d3446)

Author: alexey-tikhonov

Makefile.am

@@ -4613,7 +4613,6 @@ gpo_child_SOURCES = \
     src/util/util.c \
     src/util/util_ext.c \
     src/util/util_errors.c \
-    src/util/signal.c \
     src/util/sss_chain_id.c
 gpo_child_CFLAGS = \
     $(AM_CFLAGS) \