[jhbuild] environment: Unset CONFIG_SITE, which was causing issues on openSUSE.

[Hans Petter <hansp src gnome org>]

commit c4192505efc7cf88041dbcb6de8153c2fc596902
Author: Hans Petter Jansson <hpj cl no>
Date:   Fri Nov 25 00:52:01 2016 +0100

    environment: Unset CONFIG_SITE, which was causing issues on openSUSE.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=745223

 jhbuild/environment.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/jhbuild/environment.py b/jhbuild/environment.py
index 02ab939..81d368c 100644
--- a/jhbuild/environment.py
+++ b/jhbuild/environment.py
@@ -116,6 +116,8 @@ def setup_env_defaults(system_libdirs):
                 valarr.remove(x)
         os.environ['LD_PRELOAD'] = ' '.join(valarr)
 
+    del os.environ['CONFIG_SITE']
+
 def setup_env(prefix):
     '''set environment variables for using prefix'''