x11: Clean up x11_window_create()
x11: Clean up x11_window_create()

XCB requires that the `attrib_list` parameter to xcb_create_window() be
sorted in the same order as `enum cw_t`. Document this, and reorder the
enums in `attrib_mask` to match `attrib_list`.

Signed-off-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

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