- Update to gnuplot 5.2.6
* NEW keyword "keyentry" places an entry in the key without actually plotting
* NEW "set style boxplot medianlinewidth "
* CHANGE drop non-working support for CIE/XYZ color space
* CHANGE strptime ignores content read with format a/A/w/W
* FIX various corner-case bugs and overruns found by fuzzing
* FIX revise waitforinput in x11 terminal
* FIX revise waitforinput and terminal close events in qt terminal
* FIX revise waitforinput and new window events in monothreaded wxt terminal
* FIX lua.trm compatibility with lua version 5.3
* FIX error line reporting inside an if/else bracketed clause
* FIX error in date conversion for times within a nanosecond of a year boundary
- Drop patch gnuplot-e3cc539c.patch as this is fixed with update