[mutter] build: Require clutter-egl-1.0 for native backend only

[Rico Tzschichholz <ricotz src gnome org>]

commit cb084cc841ec7ed71acafea5f2d22357f657be19
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Oct 9 10:42:52 2014 +0200

    build: Require clutter-egl-1.0 for native backend only
    
    https://bugzilla.gnome.org/show_bug.cgi?id=738225

 configure.ac |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index ba09eae..b9218b5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -77,7 +77,6 @@ MUTTER_PC_MODULES="
    cairo >= 1.10.0
    gsettings-desktop-schemas >= 3.7.3
    $CLUTTER_PACKAGE >= 1.19.5
-   clutter-egl-1.0
    cogl-1.0 >= 1.17.1
    gbm >= 10.3
    upower-glib >= 0.99.0
@@ -202,7 +201,7 @@ AC_SUBST(XWAYLAND_PATH)
 
 PKG_CHECK_MODULES(MUTTER, $MUTTER_PC_MODULES)
 
-PKG_CHECK_MODULES(MUTTER_NATIVE_BACKEND, [libdrm libsystemd libinput], [have_native_backend=yes], 
[have_native_backend=no])
+PKG_CHECK_MODULES(MUTTER_NATIVE_BACKEND, [clutter-egl-1.0 libdrm libsystemd libinput], 
[have_native_backend=yes], [have_native_backend=no])
 if test $have_native_backend = yes; then
    AC_DEFINE([HAVE_NATIVE_BACKEND],[1],[Define if you want to enable the native (KMS) backend based on 
systemd])
 fi