macOS: spurious key events

[Devon7]

SDL2 mysteriously started reporting spurious keyboard events,
then mysteriously went back to normal about 28 hours later.

	Real	SDL2	Seconds
	====	====	=======
	↓RCTRL	↓RCTRL	19.337
	↓RALT	↓RALT	24.903
		↑RCTRL	24.905
		↑RALT	24.905
	↓X	↓X	33.576
	↑X	↑X	33.619
	↑RALT	↓RCTRL	38.900
	↑RCTRL	↑RCTRL	44.117

↓ SDL_KEYDOWN
↑ SDL_KEYUP

	Peace
		--Devon

P.S. Nothing in MacOS changed prior to this lossage,
except installing a new speech recognition language.
No SDL apps were running when the syndrome began/ended.
Multiple SDL apps were affected. No non-SDL apps were.