fix file_util in windows
Summary: For MSVC, `ssize_t` and `std::make_signed_t<std::size_t>` are different types (even though both are 32 bit signed integer, `std::is_same` is false: https://godbolt.org/z/n4Wfbh3nM). This creates type mismatch between header and cpp file. This diff changed to include `folly/portability/SysTypes.h` which defines `ssize_t` in a portable way. Reviewed By: ot Differential Revision: D31722673 fbshipit-source-id: c8968d5e0b5ac12d8d6ab4c141f791cb73d80686
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