Removed warnings printed when GL functions are not found.  - Missing functions may well be the normal state; all OpenGL stacks are not equal.  - If we attempt to _use_ a missing function, a descriptive error is raised,    so it is unlikely anyone will miss these messages.
Removed warnings printed when GL functions are not found.
 - Missing functions may well be the normal state; all OpenGL stacks are not equal.
 - If we attempt to _use_ a missing function, a descriptive error is raised,
   so it is unlikely anyone will miss these messages.

QuLogic/vispy,sh4wn/vispy,julienr/vispy,jay3sh/vispy,jdreaver/vispy,sbtlaarzc/vispy,drufat/vispy,bollu/vispy,kkuunnddaannkk/vispy,sh4wn/vispy,srinathv/vispy,dchilds7/Deysha-Star-Formation,bollu/vispy,hronoses/vispy,ghisvail/vispy,Eric89GXL/vispy,dchilds7/Deysha-Star-Formation,michaelaye/vispy,drufat/vispy,QuLogic/vispy,julienr/vispy,michaelaye/vispy,jay3sh/vispy,jdreaver/vispy,ghisvail/vispy,kkuunnddaannkk/vispy,Eric89GXL/vispy,Eric89GXL/vispy,bollu/vispy,hronoses/vispy,sbtlaarzc/vispy,RebeccaWPerry/vispy,drufat/vispy,RebeccaWPerry/vispy,RebeccaWPerry/vispy,QuLogic/vispy,ghisvail/vispy,sbtlaarzc/vispy,jdreaver/vispy,jay3sh/vispy,julienr/vispy,inclement/vispy,inclement/vispy,kkuunnddaannkk/vispy,srinathv/vispy,sh4wn/vispy,dchilds7/Deysha-Star-Formation,srinathv/vispy,michaelaye/vispy,inclement/vispy,hronoses/vispy