[clutter] build: The EGL backend is no longer experimental

[Emmanuele Bassi <ebassi src gnome org>]

commit a82b97e00050b578e8b11e1bdd31ab05c26a4f9d
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sat Mar 14 23:26:39 2015 +0000

    build: The EGL backend is no longer experimental
    
    It's used by GNOME Shell on Wayland, and it's automatically tested on
    build.gnome.org — I say we can remove the experimental backend flag.

 configure.ac |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b10ac69..18b5e75 100644
--- a/configure.ac
+++ b/configure.ac
@@ -428,8 +428,6 @@ AS_IF([test "x$enable_egl" = "xyes"],
       [
         CLUTTER_BACKENDS="$CLUTTER_BACKENDS egl"
 
-        experimental_backend="yes"
-
         SUPPORT_EGL=1
         SUPPORT_COGL=1