add gray8 format support to glupload (0.10)

[comic fans]

Hello everyone ,this is a simple patch to implement gray8 format  support
on glupload element. I  only put this support on OpenGL code path  (have
not apply to GLES code path) , and test this code on my AMD HD 6310 (GPU in
E-350 APU , fglrx 12.104)  with following command :

gst-launch-0.10 videotestsrc ! video/x-raw-gray, bpp=\(int\)8,
depth=\(int\)8 , width=\(int\)640, height=\(int\)480,
framerate=\(fraction\)4/1, pixel-aspect-ratio=\(fraction\)1/1 !  glupload !
glimagesink  .

 it use luminance texture , which should be supported by most graphics
card.  attachment is the patch file, thank you for reviewing.
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