[effects] Properly announce/remove support in blur/contrast if shader fails

Review Request #125444 - Created Sept. 29, 2015 and submitted

Information
Martin Flöser
kwin
master
0dd7b39...
Reviewers
kwin
mart
Following the approach how it's done for X11: only create the interface
if the shader succeeded to compile and remove support again if it failed
to compile after a reconfigure.

Only compile tested.

Marco Martin
Martin Flöser
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted with commit 044e2a05b266b9cba8ab05f90a47832c5ee9d8d8 by Martin Gräßlin to branch master.
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