Log Message:
Update to 0.26

Upstream changes:
0.26 2022-04-21
- fix test-failure caused if CXX is set - thanks @hroncok for report

0.25 2022-04-20
- ignore environment variables CXXFLAGS, CXXLDFLAGS (#26) - thanks @hroncok for \ 
report

0.24 2022-04-19
- support environment variables CXX, CXXFLAGS, CXXLDFLAGS - thanks @dpryan79 for \ 
suggestion