Merge branch 'feature/fix-compiler-flag-tests' into 'master'

[CMake] Get rid of deprecated check_cxx_accepts_flag()

The CMake module TestCXXAcceptsFlag and the accompanying function
check_cxx_accepts_flag() have been deprecated since CMake 3.0, the
replacements are CheckCXXCompilerFlag and check_cxx_compiler_flag().

Thanks to Dirk Ribbrock for reporting the problem via email.

See merge request !39