math/wxmaxima: Update to 19.08.1
Changelogs since 19.07.0:
https://github.com/wxMaxima-developers/wxmaxima/releases/tag/Version-19.08.1
https://github.com/wxMaxima-developers/wxmaxima/releases/tag/Version-19.08.0
PR: 239885
Submitted by: Lorenzo Salvadore <phascolarctos@protonmail.ch> (maintainer)
MFH: 2019Q3