[gnome-games] build: Depend on libxml-2.0

[Adrien Plazas <aplazas src gnome org>]

commit c4322a7f58f2d21605497deda4fae2d25f0fbdd1
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Thu May 26 16:02:34 2016 +0200

    build: Depend on libxml-2.0
    
    Add libxml-2.0 as a dependency and compile the application with it.
    
    This will be used in the next commits to read the XML-based Gameinfo
    documents.

 configure.ac    |    1 +
 src/Makefile.am |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 26edb1a..7d7adbc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,6 +53,7 @@ PKG_CHECK_MODULES(GNOME_GAMES, [
        grilo-0.3
        gtk+-3.0
        libsoup-2.4
+       libxml-2.0
        retro-gobject-0.6
        retro-gtk-0.6
        tracker-sparql-1.0
diff --git a/src/Makefile.am b/src/Makefile.am
index b90ec18..1b3379d 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -160,6 +160,7 @@ gnome_games_VALAFLAGS = \
        --pkg grilo-0.3 \
        --pkg gtk+-3.0 \
        --pkg libsoup-2.4 \
+       --pkg libxml-2.0 \
        --pkg tracker-sparql-1.0 \
        --pkg retro-gobject-0.6 \
        --pkg retro-gtk-0.6 \