[retro-gtk] Add missing file in automake

[Adrien Plazas <aplazas src gnome org>]

commit cbd9fac71b2fcc77e8a2c3b68a1375de704556c9
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Thu Jan 26 07:25:35 2017 +0100

    Add missing file in automake
    
    Add src/core-error.vala to the build system.

 retro-gobject/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/retro-gobject/Makefile.am b/retro-gobject/Makefile.am
index 64e6558..710c577 100644
--- a/retro-gobject/Makefile.am
+++ b/retro-gobject/Makefile.am
@@ -40,6 +40,7 @@ libretro_gobject_la_SOURCES = \
        variable/variables.vala \
        av-info.vala \
        core.vala \
+       core-error.vala \
        disk-controller.vala \
        game-info.vala \
        memory.vala \