Log Message:
libxlsxwriter: Update to 0.8.5

Patch provided by Sijmen J. Mulder via tech-pkg@, thanks!

pkgsrc changes:
 - Remove patches/patch-Makefile, it was imported upstream

Changes:
0.8.5
-----
 - Fix compile-time warnings with strict prototypes enabled.
 - Additional formatting tests.
 - Make py.test name configurable.