Fix c_char vs u8 errors in the linux_raw backend.
#971
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Fix the linux_raw backend to handle the case where linux-raw-sys defines `c_char` as `i8`. linux-raw-sys used to always define `c_char` as `u8` because it usually isn't important to match the platform `char` type, but that makes it inconvenient to work with Rust's `CStr`/`CString` types which use `c_char`, so linux-raw-sys has started defining `c_char` as `i8` on platforms which define it that way.
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Fix the linux_raw backend to handle the case where linux-raw-sys defines
c_charasi8.linux-raw-sys used to always define
c_charasu8because it usually isn't important to match the platformchartype, but that makes it inconvenient to work with Rust'sCStr/CStringtypes which usec_char, so linux-raw-sys has started definingc_charasi8on platforms which define it that way.