Unconditionally disable network check for new versions (from Fedora).

diff -u /home/dlove/rpmbuild/BUILD/cube-4.3.4/src/GUI-qt/display/VersionCheckWidget.cpp\~ /home/dlove/rpmbuild/BUILD/cube-4.3.4/src/GUI-qt/display/VersionCheckWidget.cpp
--- cube-4.3.4/src/GUI-qt/display/VersionCheckWidget.cpp~	2016-04-03 00:05:37.942066948 +0100
+++ cube-4.3.4/src/GUI-qt/display/VersionCheckWidget.cpp	2016-05-06 17:16:31.648143908 +0100
@@ -52,7 +52,8 @@
     url              = QUrl( UPDATE_CHECK_URL );
     download         = NULL;
     update_Available = false;
-    bool no_http = env_str2bool( getenv( "CUBE_DISABLE_HTTP_DOCS" ) );
+    // bool no_http = env_str2bool( getenv( "CUBE_DISABLE_HTTP_DOCS" ) );
+    bool no_http = true;
     if ( !no_http )
     {
         updateDescription =   tr( "Check for update is not performed yet." );

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