tdf#108318 rtfexport: no hyperlink target for clipboard

This fixes copying hyperlinks from Writer to the other apps
like Calc or even to editeng components within Writer.

External apps never seem to call for RTF clipboard.
Certainly firefox doesn't - and everything I tested
seems to just request plain text URL strings.

I don't see anywhere in the RTF specification that a
\fldinst can take formatting parameters along with the URL.
That is likely only a DOCX thing.
But since RTF shares import code with DOCX, it gets the parsing
for free, so we explicitly use it to round-trip targets in RTF.
See commit 31de0ac30d6c521ad663db78feb936688be5bccb
Author: Miklos Vajna on Tue Feb 14 09:32:25 2017 +0100
RTF import: handle target of hyperlink

Alternatively I could have had editeng parse the flags
on clipboard RTF import, but handling it at export
seemed cleaner to me.

Change-Id: Ic34bcf99edf7bd3fb404ed312c07acae0ef814e1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/158744
Tested-by: Jenkins
Reviewed-by: Justin Luth <jluth@mail.com>

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