[Groff] getopt issues building 1.19.2

[Peter O'Gorman]

Hi,
There were some issues with getopt.h on, for example, Tru64. On that
platform, stdio.h #include's getopt.h, so the __GETOPT_PREFIX was not
set when groff's getopt.h was included, leading to linker errors.

The solution is simply to move the __GETOPT_PREFIX #define to before all
the #include statements.

Thanks,
Peter

groff.patch
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