[Impeller] Cast chat8_t* to char* for MSSTL compat #36223
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Noticed when syncing impeller-cmake.
In MSSTL,
Path::u8stringreturns anstd::u8string, which is spec abiding. However, libcxx returns anstd::string. Our interfaces useconst char*andstd::stringfor paths, but Clang doesn't do implicit conversions forchar8_t->char. This is a safe cast because the underlying type ofchar8_tis defined by the spec to beunsigned char.