Log Message:
textproc/libxlsxwriter: update to 0.8.6

Upstream changes:
 - Fixed issue where images that started in hidden rows/columns weren't
   placed correctly in the worksheet.
 - Fixed the mime-type reported by system file(1). The mime-type
   reported by "file --mime-type"/magic was incorrect for XlsxWriter
   files since it expected the [Content_types] to be the first file in
   the zip container.

Package changes:
 - Fixed libxlsxwriter.so not picking up libz.so from buildlink.