glx/dri: Initialize reset to __DRI_CTX_RESET_NO_NOTIFICATION.

glx/dri: Initialize reset to __DRI_CTX_RESET_NO_NOTIFICATION.

If the application has requested reset notification, then
dri2_convert_glx_attribs will initialize this to the correct value.

Otherwise, it's supposed to initialize this to NO_NOTIFICATION, but
doesn't when num_attribs == 0.  (The consensus seems to be that we
should make it do so, but that's more invasive, so I'm pushing this for
now.)

Fixes a regression since a8724d85f8cb2f0fb73b9c6c1f268f9084c6d473
where trying to run OilRush_x86 or apitrace heaven_x64 would result in:

dri_util.c:221: dri2CreateContextAttribs: Assertion `!"Should not get
here."' failed.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=53076
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>