libxslt: upgrade to version 1.1.28

- from libxslt-configure.patch:
  * drop config.sub Android stuff (obsolete)
  * drop MinGW archive checks (obsolete)
  * split out libxslt-config.patch.1
  * split out libxslt-freebsd.patch.1
- drop libxslt-aix.patch:
  presumably don't need special check for V7BETA since it's released now
- drop libxslt-mingw.patch (it's for msys build so obsolete)
- drop libxslt-win_manifest.patch:
  this can just be passed on configure.js command line so no need for a patch

Change-Id: I8a2cad0a70a86ba1dffbe3c8fce60babb70a61f6
Reviewed-on: https://gerrit.libreoffice.org/6641
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>