At least for cygwin64 windres, a wider number of cross-building
targets are supported. Utilize that for getting suitable versionrc
arch built, obviating the need to disable x86_64 on cyg32 and vice
versa.

Change-Id: I9770a3c1d6602a9747b5b3caa4961d66c471f4e4
Reviewed-on: https://gerrit.libreoffice.org/45763Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
(cherry picked from commit 293df86b)
Reviewed-on: https://gerrit.libreoffice.org/45767Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>