glog: gflags compatibility fix

Closes #34416. The upstream issue tracker for Glog is pretty dead, and
gflags development seems to be outpacing it considerably, so vendoring
the old version of gflags is a workaround.

Closes #34451.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
glog: add 0.3.3 bottle.