For Windows (non-MSVC) builds, fix makefiles to support all combinati… #386

Job	Run time
squeak.cog.spur for win64x64	2m 55s
squeak.cog.spur for win64x64 (DEBUG)	2m 34s
squeak.cog.spur for win64x64 (ASSERT)	3m 30s
squeak.stack.spur for win64x64	3m 38s
squeak.stack.spur for win64x64 (DEBUG)	3m 6s
squeak.stack.spur for win64x64 (ASSERT)	3m 1s
squeak.sista.spur for win64x64	3m 30s
squeak.sista.spur for win64x64 (DEBUG)	2m 28s
squeak.sista.spur for win64x64 (ASSERT)	3m 52s
squeak.cog.spur for win32x86	3m 10s
squeak.cog.spur for win32x86 (DEBUG)	2m 14s
squeak.cog.spur for win32x86 (ASSERT)	2m 49s
squeak.stack.spur for win32x86	2m 51s
squeak.stack.spur for win32x86 (DEBUG)	2m 11s
squeak.stack.spur for win32x86 (ASSERT)	3m 33s
squeak.sista.spur for win32x86	2m 57s
squeak.sista.spur for win32x86 (DEBUG)	2m 11s
squeak.sista.spur for win32x86 (ASSERT)	3m 4s
	53m 34s

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