Revert "glog: gflags compatibility fix"

This reverts commit d12fcb69b9f8aaa29552195baec4c8099fcef32f.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Revert "gflags 2.1.1"

This reverts commit fc18d80715e33ef17f0c238413e2ce51f0077cc6.

Closes #34533.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>