Auto merge of #252 - dporru:compile-debug, r=glennw
Auto merge of #252 - dporru:compile-debug, r=glennw

Change compile_shader debug println to log

This should fix https://github.com/servo/servo/issues/10273

servo/webrender,servo/webrender,alanamramjit/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender,alanamramjit/webrender