"test -e" in testsuite doesn't work with Solaris /bin/sh

The testsuite/mk/boilerplate.mk contains stuff like:

$(eval $(call canonicaliseExecutable,TEST_HC))
ifeq "$(shell test -e '$(TEST_HC)' && echo exists)" ""
$(error Cannot find ghc: $(TEST_HC))
endif

On Solaris, the /bin/sh test builtin does not support the -e flag. It does support both -f and -x, meaning regular and executable file respectively. I think we probably mean -x in this case anyway. With that fix the testsuite seems to run ok.

Looks like we already use test -x elsewhere in testsuite/mk/boilerplate.mk so we can assume that it does work with the shell of other platforms.

Trac metadata

Trac field	Value
Version	6.12.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Test Suite
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