[gnome-music/mschraal/libgdbuildfix] configure: Add gtk-hacks to libgd init

[Marinus Schraal <mschraal src gnome org>]

commit 217b272633eacdc73e1b8e02c503a40a446550b5
Author: Marinus Schraal <mschraal gnome org>
Date:   Fri Dec 15 00:45:43 2017 +0100

    configure: Add gtk-hacks to libgd init
    
    GdMainView uses gtk-hacks, but the m4 does not correctly select it
    for us. This results in a build failure. Force it during configuration
    to be safe.

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 281c2d2..ec90a8c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,7 +26,7 @@ AC_PROG_CC
 AM_PROG_CC_C_O
 LT_INIT([disable-static])
 
-LIBGD_INIT([main-view gir tagged-entry])
+LIBGD_INIT([main-view gir tagged-entry gtk-hacks])
 
 PKG_PROG_PKG_CONFIG([0.22])