Revise and simplify the -fstruct-return and -fstruct-passing options.

- Rename '-fstruct-return' into '-fstruct-passing', because this emulation affects both function result passing and function argument passing.  Keep '-fstruct-return' as a deprecated synonymous for '-fstruct-passing'
- Remove the ability to change the ABI for struct passing via the '-fstruct-passing=<abi>' and '-fstruct-return=<abi>' command-line flags.  This was more confusing than useful.
- Produce an error if a struct/union is passed as function argument and '-fstruct-passing' is not set.  This used to be supported, using CompCert's default ABI for passing struct arguments.  However, this default ABI does not match any of the standard ABIs of our target platforms, so it is better to reject than to silently produce ABI-incompatible code.

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