Always use the python timeout program on non-Windows

Use a python timeout program, so that we don't have to worry about
whether or not the compiler we're testing has built the timeout
program correctly

The python timeout program doesn't work on mingw, so we still use the
Haskell program on Windows

testsuite/mk/boilerplate.mk

@@ -134,3 +134,10 @@ CP = cp
 RM = rm -f
 PYTHON = python
 
+$(eval $(call get-ghc-rts-field,HostOS,Host OS))
+ifeq "$(HostOS)" "mingw32"
+WINDOWS = YES
+else
+WINDOWS = NO
+endif
+

testsuite/timeout/Makefile

@@ -19,7 +19,10 @@ ifneq "$(GCC)" ""
 WITH_GCC = --with-gcc='$(GCC)'
 endif
 
-ifeq "$(filter thr, $(GhcRTSWays))" ""
+ifeq "$(WINDOWS)" "NO"
+# Use a python timeout program, so that we don't have to worry about
+# whether or not the compiler we're testing has built the timeout
+# program correctly
 $(TIMEOUT_PROGRAM): timeout.py
 	rm -rf install-inplace
 	mkdir install-inplace
@@ -27,6 +30,8 @@ $(TIMEOUT_PROGRAM): timeout.py
 	cp $< $@
 	chmod +x $@
 else
+# The python timeout program doesn't work on mingw, so we still use the
+# Haskell program on Windows
 $(TIMEOUT_PROGRAM): timeout.hs
 	rm -rf install-inplace
 	'$(TEST_HC)' --make Setup