Do not use some deprecated function with core ctx
Additionnal work.
Fix another bunch of deprecated function calls
Remove glDisable(GL_ALPHA_TEST)
Another couple of glDisable(GL_ALPHA_TEST)
Declare bool in CIrrDeviceLinux
Revert "Declare bool in CIrrDeviceLinux"

This reverts commit 35de5d39753b61794031f67bd95f5047dd858fe4.
Set useCoreContext outside of ifdef windows
Remove some others deprecated calls
Another fix
Use core context except for legacy
Use core context for linux too.
Try to fix linux
Try to fix linux, round 2
Reapply patch from http://sourceforge.net/p/glew/patches/40/

This reverts commit dd70f09fcec801863d919fceaac906a7957633a5.
Merge remote-tracking branch 'origin/glplaincore'
Clean some code