Win32: don't apply swig patch on this platform

The current version of the patch tool in our build chain
can't handle this patch.
This is not a problem (for now) because
a. our windows build is still using guile 1.8
b. we're not creating release tarballs on windows

Hopefully swig itself is updated before we move to guile 2 on Windows

This reverts commit e48381ecf90b557b96f6b6a619e3c3e379cfc7a8.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@23743 57a11ea4-9604-0410-9ed3-97b8803252fd