cygport: distinguish between x86 and x86_64

[Achim Gratz]

Corinna Vinschen writes:
>> What is the official way to conditionalize .cygport files for
>> differences in x86 and x86_64 architectures ?
>
> "${ARCH}" is either "i686" or "x86_64"

For tests in the cygport file it is usually easier to use the ARCH_i686
or ARCH_x86_64 variables.


Regards,
Achim.
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