see https://releases.llvm.org/17.0.1/tools/clang/docs/UsersManual.html#generating-a-pch-file

syntax examples:
`zig cc -x c-header test.h -o test.pch`
`zig cc -include-pch test.pch main.c`

`zig c++ -x c++-header test.h -o test.pch`
`zig c++ -include-pch test.pch main.cpp`