configure: Warn for a 64-bit build without CFI directive support.

Ken Thomases ken at
Thu Jun 4 13:57:59 CDT 2015

On 64-bit, DWARF unwind info is crucial for unwinding the stack during
exception handling.  Without support for CFI directives, Wine's assembly code
won't have DWARF unwind info and stack unwinding will go badly wrong.

This means, for example, that RtlRaiseException won't be able to unwind out of
--- | 4 ++++
1 file changed, 4 insertions(+)

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