Log Message:
libxlsxwriter: Update to 0.9.3

Changes in 0.9.3:
 - Fix Xcode/Cocoapods build warnings.

Changes in 0.9.2:
 - Added support for writing cell comments, see working_with_comments.

Changes in 0.9.2 but unlisted in changelog:
 - Makefile now respects DESTDIR and PREFIX, including when setting
   rpath on macOS.
 - Removal of deprecated functions.
 - Naming changes in bundled MD5 code to avoid conflicts with OpenSSL.
 - Warning fixes (int sizes etc).
 - __atribute__((deprecated)) not used on GCC < 5.
 - Fix for vba_name allowing illegal worksheet codename.

Package changes:
 - No longer set now unused INSTALL_DIR since DESTDIR and PREFIX are
   now respected.
 - The macOS $(PREFIX) patch has been merged upstream.