glsl: Output shader filename when GLSL compilation fails.
glsl: Output shader filename when GLSL compilation fails.

stevenlovegrove/Pangolin,wxdzju/Pangolin,randi120/Pangolin,tschmidt23/Pangolin,visigoth/Pangolin,tschmidt23/Pangolin,stevenlovegrove/Pangolin,wxdzju/Pangolin,tschmidt23/Pangolin,arpg/Pangolin,randi120/Pangolin,pinglin/Pangolin,mp3guy/Pangolin,visigoth/Pangolin,stevenlovegrove/Pangolin,arpg/Pangolin,pinglin/Pangolin,renzodenardi/Pangolin,renzodenardi/Pangolin,mp3guy/Pangolin,mp3guy/Pangolin