cgl: Don't support Mac OS <= 10.4
cgl: Don't support Mac OS <= 10.4

To my knowledge, Waffle has never been tested on Mac OS <= 10.4. So it's wise
to mark that as unsupported until someone tests it.

Subsequent commits improve Waffle's handling of
WAFFLE_CONTEXT_MAJOR/MINOR_VERSION, but those improvements require knowledge of
which OpenGL versions are supported by the platform.  I don't know the range of
OpenGL versions supported on Mac OS <= 10.4.  Hence another reason to not
support the older versions.

CC: Nigel Stewart <67c359a508596b50f5aa4b1f48bdf08470ed470b@gmail.com>
CC: Jeff Bland <cce67cf12714170e6f407e53377c7dccdc825f60@linux.com>
Signed-off-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

dcbaker/waffle,maurossi/waffle,janesma/waffle,janesma/waffle,fjhenigman/waffle,yinquan529/waffle-gl-waffle,evelikov/waffle,dcbaker/waffle,chadversary/waffle,evelikov/waffle,fjhenigman/waffle,fjhenigman/waffle,yinquan529/waffle-gl-waffle,waffle-gl/waffle,waffle-gl/waffle,janesma/waffle,dcbaker/waffle,yinquan529/waffle-gl-waffle,maurossi/waffle,chadversary/waffle,waffle-gl/waffle,chadversary/waffle,evelikov/waffle,waffle-gl/waffle,maurossi/waffle