options: drop unnecessary casts

the reason for these casts are unknown but they were presumably to
silence warnings 9 years ago. but it doesn't seem to be necessary
nowadays, so just drop the casts and also drop the `const` from the
compound literal type.

some small technical notes:

1. while string literals aren't `const` in C, writing to them is
   undefined (do not ask me why). and so compilers will typically put
   string literals into read only section anyways, regardless of
   weather `const` was used in the source or not. so this shouldn't make
   any difference codegen wise.
2. making the array of pointers `const` on the other hand might affect
   codegen, eg: `(char *const []){...}`. however, that'd trigger a lot
   of discarded qualifier warnings.

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