Some Makefile/GHCi tests timeout on Windows

It looks like the following tests currently timeout on Windows:

T11072gcc and T11072msvc (which only run on Windows)
T12771
T13082_good
T14611

All of these tests share a common characteristic: they are makefile_tests which invoke ghci. For instance,

T12771:
	'$(TEST_CC)' -c foo.c -o foo.o
	'$(AR)' rsc libfoo.a foo.o
	'$(TEST_HC)' -shared foo_dll.c -o libfoo-1.dll
	mv libfoo-1.dll.a libfoo.dll.a
	echo main | '$(TEST_HC)' $(TEST_HC_OPTS_INTERACTIVE) main.hs -lfoo -L"$(PWD)"

Edited Sep 18, 2020 by Ben Gamari

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