change ShaderCOptions.includeDirs to an array of C strings

[samloeschen]

Avoids segfault when providing more than one include path. [:0]const u8 strings seem to work fine everywhere else, but includeDirs needs to be a [*c]const u8 to keep shaderc happy

[OndraVoves]

Nice catch 😄 there is same problem with defines and dependencies in the same struct. Can you please fix it in your MR?

P.S.: Add yourself to section ## Other Contributors in AUTHORS.md ;)

[samloeschen]

done and done! bindings have been great so far btw 👍

[OndraVoves]

Nice and Thanks ;)