mk: Remove check-fast target

Author: brson

mk/tests.mk

@@ -194,9 +194,6 @@ check-ref: cleantestlibs cleantmptestlogs check-stage2-rpass \
 check-docs: cleantestlibs cleantmptestlogs check-stage2-docs
 	$(Q)$(CFG_PYTHON) $(S)src/etc/check-summary.py tmp/*.log
 
-# NOTE: Remove after reprogramming windows bots
-check-fast: check-lite
-
 # Some less critical tests that are not prone to breakage.
 # Not run as part of the normal test suite, but tested by bors on checkin.
 check-secondary: check-lexer check-pretty