Eduardo Arias 59254fe3bd Simplifiy configuration to build libModSecurity with std C++17
- Leveraged autoconf again to check whether the C++ compiler supports
  the required standard version and build using it.
- Replaced the outdaded `ax_cxx_compile_stdcxx_11.m4` macro with the
  latest version of `ax_cxx_compile_stdcxx` which supports C++17.
  - https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
  - https://raw.githubusercontent.com/autoconf-archive/autoconf-archive/e4e5269db2764b9f53d759c24750ac6ca38e02ea/m4/ax_cxx_compile_stdcxx.m4
- This should also streamline updating to C++20 in the future.
2024-08-08 11:23:35 -07:00
..