Fix math_tests.cpp on ppc64le #291
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The 2 assertions fails on ppc64le. The macros
CHAR_MAXandCHAR_MINdo not guaranteesigned charwould be returned. The reason behind is that on PowerPC usesunsigned charinstead ofsigned charlike that of x86_64 systems. GCC has-fsigned-charbuild flag to enforce the behaviour.Ref: https://www.linuxtopia.org/online_books/an_introduction_to_gcc/gccintro_71.html