[gnome-settings-daemon] build: Fix shadowing of libexec_PROGRAMS in power plugin Makefile.am

[Bastien Nocera <hadess src gnome org>]

commit e93bef756744edde12735f827e66afa7a3cc2ac4
Author: Philip Withnall <withnall endlessm com>
Date:   Thu Feb 9 11:33:43 2017 +0000

    build: Fix shadowing of libexec_PROGRAMS in power plugin Makefile.am
    
    This was causing the gsd-power plugin to not be built if HAVE_GUDEV was
    defined (and gsd-backlight-helper was being built). Fixes the
    corresponding automake warning.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778383

 plugins/power/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/power/Makefile.am b/plugins/power/Makefile.am
index 336dd56..94606ad 100644
--- a/plugins/power/Makefile.am
+++ b/plugins/power/Makefile.am
@@ -64,7 +64,7 @@ EXTRA_DIST =                                          \
        $(NULL)
 
 if HAVE_GUDEV
-libexec_PROGRAMS = gsd-backlight-helper
+libexec_PROGRAMS += gsd-backlight-helper
 
 gsd_backlight_helper_LDFLAGS =                         \
        $(BACKLIGHT_HELPER_LIBS)                        \