Added support for GL_ARB_texture_rectangle to shader validator.

Added support for GL_ARB_texture_rectangle to shader validator.

Parser was regenerated with the flex/bison shipped with Ubuntu 10.04.

BUG=251 http://code.google.com/p/angleproject/issues/detail?id=251
TEST=tested with new Core Animation plugin rendering path on Mac OS X
Committed: http://code.google.com/p/angleproject/source/detail?r=888

[kbr1, 2011-11-21 23:27:45]

Hi Nicolas,

Please review this small change to the shader validator. Thanks.

[nicolas, 2011-11-22 18:23:08]

Looks great!