sys: Enable -Wunused-but-set-variable for GCC.
It has been enabled for clang for a while now. Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D39358
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@ -74,8 +74,7 @@ CWARNEXTRA?= -Wno-error=address \
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-Wno-error=sequence-point \
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-Wno-error=shift-overflow \
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-Wno-error=tautological-compare \
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-Wno-error=unused-function \
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-Wno-unused-but-set-variable
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-Wno-error=unused-function
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.if ${COMPILER_VERSION} >= 70100
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CWARNEXTRA+= -Wno-error=stringop-overflow
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.endif
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