v3.0.13
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.
Updated included headers to support compilation on Windows (using Visual C++) - most of posix related functions and constants in unistd.h can be found in io.h in Visual C++ - introduced src/compat/msvc.h to adjust for compiler differences (and avoid updating code with #ifdef blocks for Windows support) - removed some included headers that are not needed (both on Unix and Windows builds)