Back out gcc workaround per re@ request. Details: "There seems to be some continuing discussion about how this is best fixed, and we'd like to get Alexander (as our gcc guru) to opine on a final solution before picking one.  In the mean time, could you back out the original commit (sys.mk:1.89)?"
Back out gcc workaround per re@ request. Details:
"There seems to be some continuing discussion about how this is best fixed,
and we'd like to get Alexander (as our gcc guru) to opine on a final
solution before picking one.  In the mean time, could you back out the
original commit (sys.mk:1.89)?"

Approved by:	re (rwatson)

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