this ternary operator is an undefined behaviour

Let me quote ISO/IEC 9899:2018 section 6.5.15:

> Constraints
>
> The first operand shall have scalar type.
> One of the following shall hold for the second and third operands:
> — both operands have arithmetic type;
> — both operands have the same structure or union type;
> — both operands have void type;
(snip)

Here, `*option` is a const struct rb_compile_option_struct. OTOH
`COMPILE_OPTION_DEFAULT` is a struct rb_compile_option_struct, without
const.   These two are _not_ the "same structure or union type".  Hence
the expression renders undefined behaviour.  COMPILE_OPTION_DEFAULT is
not a const because `RubyVM::InstructionSequence.compile_option=`
touches its internals on-the-fly.  There is no way to meet the
constraints quoted above.

Using ternary operator here was a mistake at the first place.  Let's
just replace it with a normal `if` statement.

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