shader: Enable GL_ARB_texture_cube_map_array in shader on gles 3.1 host
The extension is part of GLSL 320 es, but must be enabled manually for a gles 3.1 host. Closes: #32 (closed)
Signed-off-by: Gert Wollny gert.wollny@collabora.com
Edited by Gert Wollny