[libmediaart] build: Fix LIBMEDIAART_BACKEND for Qt4, should be QtGui

[Martyn James Russell <mr src gnome org>]

commit 3cba0bf97a875d64c5e7259f5d7cf829876f8a12
Author: Haithem Ben Ghorbal <haithem benghorbal_ext softathome com>
Date:   Tue Apr 1 16:34:36 2014 +0100

    build: Fix LIBMEDIAART_BACKEND for Qt4, should be QtGui
    
    Affects .pc file Requires.Private value which is important.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 2214407..b4ece5a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -246,7 +246,7 @@ if test "x$enable_qt" != "xno" && test "x$enable_gdkpixbuf" != "xyes"; then
 
          AC_DEFINE(HAVE_QT4, [], [Define if we have Qt4])
          AC_DEFINE(HAVE_QT, [], [Define if we have Qt])
-         LIBMEDIAART_BACKEND=Qt4Gui
+         LIBMEDIAART_BACKEND=QtGui
 
          selected_for_media_art="yes (qt4)"
       fi