[gegl] gif-load: add libs/cflags fixing build on some platforms

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 2d0cf0e9e87292c7f01357e5bfe6f21746dcf977
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Oct 2 16:58:29 2018 +0200

    gif-load: add libs/cflags fixing build on some platforms

 operations/external/Makefile.am | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/operations/external/Makefile.am b/operations/external/Makefile.am
index 392538fb0..bfc337d32 100644
--- a/operations/external/Makefile.am
+++ b/operations/external/Makefile.am
@@ -12,6 +12,9 @@ text_la_CFLAGS = $(AM_CFLAGS) $(PANGOCAIRO_CFLAGS)
 endif
 
 ops += gif-load.la 
+gif_load_la_SOURCES = gif-load.c
+gif_load_la_LIBADD = $(op_libs)
+gif_load_la_CFLAGS = $(AM_CFLAGS)
 
 if HAVE_CAIRO
 ops += path.la vector-fill.la vector-stroke.la