Fix bug in handling CRLF line endings in ShaderLibrary

glsShaderLibrary.cpp failed to strip first empty line from shader strings
if .test file was using CRLF line endings. That was leading to further
issues later on.

Bug: 18595005
Change-Id: Ia783c2bed4c838877c80f7c51bcf3fb021b75c8f
1 file changed