[retro-gtk] build: Fix retro-video-converter.c build deps

[Adrien Plazas <aplazas src gnome org>]

commit 52e84d132d7495cd613f597011824b919da82524
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Tue Feb 14 16:49:19 2017 +0100

    build: Fix retro-video-converter.c build deps
    
    Ensure the internal header is built before retro-video-converter.c.

 retro-gtk/Makefile.am |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/retro-gtk/Makefile.am b/retro-gtk/Makefile.am
index e3da0ab..37c7e39 100644
--- a/retro-gtk/Makefile.am
+++ b/retro-gtk/Makefile.am
@@ -72,6 +72,8 @@ libretro_gtk_la_SOURCES = \
        video/video-filter.vala \
        $(NULL)
 
+video/retro-video-converter.c: retro-gtk-internal.h
+
 retro-core.c: retro-gtk-internal.h
 
 retro-environment.c: retro-gtk-internal.h libretro-environment.h