Fix finite() not being defined on MSVC. · kristomu/quadelect@eac6d37

Build: src/singlewinner/brute_force/general_rpn/gen_custom_function.cc#L11

'argument': conversion from 'size_t' to 'int', possible loss of data

Build: src/singlewinner/brute_force/general_rpn/gen_custom_function.cc#L26

'argument': conversion from 'size_t' to 'int', possible loss of data

Build: src/singlewinner/brute_force/general_rpn/gen_custom_function.cc#L32

'argument': conversion from 'size_t' to 'int', possible loss of data

Build: src/singlewinner/brute_force/general_rpn/gen_custom_function.cc#L38

'=': conversion from 'size_t' to 'int', possible loss of data

Build: src/singlewinner/brute_force/general_rpn/gen_custom_function.cc#L49

'=': conversion from 'size_t' to 'int', possible loss of data

Build: src/singlewinner/brute_force/general_rpn/gen_custom_function.cc#L151

'argument': conversion from 'size_t' to '_Ty', possible loss of data

Build: src/singlewinner/brute_force/general_rpn/gen_custom_function.cc#L206

'argument': conversion from 'size_t' to 'int', possible loss of data

Build: src/singlewinner/brute_force/general_rpn/gen_custom_function.cc#L206

'argument': conversion from 'size_t' to 'int', possible loss of data

Build: src/singlewinner/brute_force/general_rpn/gen_custom_function.cc#L209

'argument': conversion from 'size_t' to '_Ty', possible loss of data

Build: src/singlewinner/brute_force/general_rpn/gen_custom_function.cc#L459

'argument': conversion from 'size_t' to 'int', possible loss of data

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