Leak above window during rain, is this caused by a masonry drainage problem?
This turned out to be due to a problem with the installation of the window directly above the window where the water was evident. That upper window (the one in the last photo in the question) had a gap between the sill and the flashing at the bottom of that window was not caulked. Some of the rainwater that gathered on the sill found its way back into the wall through that gap and ran down the inside of the brick wall, ultimately draining out through the drywall above the lower window opening.