title: [LLVM-9 clang-9 OSX]: std::filesystem::path unrecognized
body: <p>Hello after upgrading on OSX Mojave to the version LLVM-9 using <code>brew upgrade llvm</code></p>
  
  <p>I got the following error:</p>
  
  <pre><code>In file included from /Users/roman/CLionProjects/Milerius/antara-gaming-sfml-template/cmake-build-debug/_deps/antara-gaming-sdk-src/modules/core/antara/gaming/core/real.path.cpp:17:
  /Users/roman/CLionProjects/Milerius/antara-gaming-sfml-template/cmake-build-debug/_deps/antara-gaming-sdk-src/modules/core/antara/gaming/core/real.path.hpp:23:22: fatal error: 'path' is unavailable: introduced in macOS 10.15
      std::filesystem::path binary_real_path() noexcept;
                       ^
  /usr/local/opt/llvm/bin/../include/c++/v1/filesystem:738:24: note: 'path' has been explicitly marked unavailable here
  </code></pre>
  
  <p>my code:</p>
  
  <pre class="lang-cpp prettyprint-override"><code>#include &lt;filesystem&gt;
  
  namespace antara::gaming::core
  {
      std::filesystem::path binary_real_path() noexcept;
      std::filesystem::path assets_real_path() noexcept;
  }
  </code></pre>
  
  <p>Is this normal ?</p>