gctx_gl: enable debug output if DEBUG_GL is defined
gctx_gl: enable debug output if DEBUG_GL is defined

Signed-off-by: Matthieu Bouron <3a7e863fe913178152052b1d1157ef537eee421e@gmail.com>

gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl