Drop support for cygwin i686 building Win64 binaries? (was: Windows builders will need a cygwin gcc now)

[Thorsten Behrens]

Dear fellow hackers,

after three more fixes on master, we now have (almost) universal gpgme
support for Windows.

There's one snag left, as you see in

https://gerrit.libreoffice.org/#/c/45769/ :

Sadly cygwin i686's windres does not support 64 bit targets, which
makes it impossible on that platform to produce Win64
binaries. Instead of subtly disabling the feature for that
combination, the above patch breaks support for building Win64 from a
32bit cygwin, for 6.1 and onwards.

All CI and release builders are already running cygwin64, and so I
believe are most of you - at least lode defaults to cygwin64 since
quite a while, on supporting Windows installations.

Or is there a good reason to keep universal cygwin32 support around?

Cheers,

-- Thorsten
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