wflinfo: use waffle_dl_sym to get core functions
wflinfo: use waffle_dl_sym to get core functions

Unlike MacOS and Linux, Windows is less fortunate to people who
prefer to fetch core OpenGL symbols via  wglGetProcAddress.

Until we merge piglit's dispatch in one shape or the other, we'll
need to manually pick/set the correct function that is used for
each function.

Signed-off-by: Emil Velikov <4c996f2f093ddd0585a556460b4cc3ba555546ef@gmail.com>
Reviewed-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

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