fix a lot of warnings -Wunused-but-set-variable and Wunused-variable when compile openBlas #5704
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related #3281
Though OpenBLAS try to reduce the warnings: OpenMathLib/OpenBLAS#1358 and OpenMathLib/OpenBLAS#1359, fixing all the warnings is a long-time work.
Thus, we can compile OpenBLAS with
-Wno-unused-but-set-variable -Wno-unused-variabletemporary.