v3.9.1
Update tests that generate CMake projects to use the CMAKE_CXX_COMPILER the main project was CMake'd with. Fixes #1747.
:wrench: add label to tests that require a git checkout
:white_check_mark: add regression test for #2281
added fuzzing results
:bookmark: set version to 3.9.1
:rotating_light: fix warnings #2113
:recycle: split regression tests
:fire: remove test Makefile targets (all handled by CMake)