Fix the GNU make and CMake configurations and CI workflows.

Change-Id: I0ed384b0598d2bdaec1d41b51cd0de5d49e83481
Reviewed-on: https://code-review.googlesource.com/c/re2/+/61270
Reviewed-by: Paul Wankadia <junyer@google.com>
Reviewed-by: Alex Chernyakhovsky <achernya@google.com>