Log Message:
textproc/libxlsxwriter: Update to 1.0.0

Changes:
 - Added support for worksheet conditional formatting.
 - Added performance optimization for search for control characters in
   strings in worksheet_write_string().
 - Made lxw_datetime_to_excel_datetime() a function public.
 - There are now over 1000 test cases, including 650 tests that compare
   the output from libxlsxwriter, byte for byte, against test files
   created in Excel. This is also the 100th release of libxlsxwriter.

Package changes:
 - Disable hardcoded -O3