avoid windres preprocessor quoting-messups with current cygwin

avoid windres preprocessor quoting-messups with current cygwin

apparently fresh installs of cygwin behave differently with the windres
command's quoting and treats --preprocessor='cpp foo bar' as a single file
"cpp foo bar" to run instead of running "cpp" with the arguments "foo"
and "bar".
(-D and -I options are passed to the preprocessor automatically, so no
need to prefix those with --preprocessor-arg)

Change-Id: I711e968206f0769ff07152ebb9572e8b71c30cec
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/114965
Tested-by: Jenkins
Reviewed-by: Georgy Litvinov <git@litvinovg.pro>
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>