iFix yet another unreasonably failing compilation issue with sa_sigac… #451

Job	Run time
squeak.cog.spur for linux64x64	2m 6s
squeak.cog.spur for linux64x64 (DEBUG)	1m 19s
squeak.cog.spur for linux64x64 (ASSERT)	1m 47s
squeak.cog.spur (itimer) for linux64x64	2m 0s
squeak.cog.spur (itimer) for linux64x64 (DEBUG)	1m 22s
squeak.cog.spur (itimer) for linux64x64 (ASSERT)	1m 39s
squeak.cog.spur for linux32x86	2m 16s
squeak.cog.spur for linux32x86 (DEBUG)	1m 56s
squeak.cog.spur for linux32x86 (ASSERT)	2m 41s
squeak.cog.spur (itimer) for linux32x86	2m 16s
squeak.cog.spur (itimer) for linux32x86 (DEBUG)	2m 15s
squeak.cog.spur (itimer) for linux32x86 (ASSERT)	2m 23s
squeak.sista.spur for linux32x86	2m 59s
squeak.stack.spur for linux64x64	1m 34s
squeak.stack.spur for linux32x86	2m 6s
	30m 39s

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