source/Platform/OSX appears to be missing

[nadiaholmquist]

Trying to build on macOS 12.2.1.

% cmake -B build -DCMAKE_BUILD_TYPE=Release
-- The C compiler identification is AppleClang 13.0.0.13000029
-- The CXX compiler identification is AppleClang 13.0.0.13000029
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
CMake Error at CMakeLists.txt:97 (add_executable):
  Cannot find source file:

    /Users/nhp/Documents/Git/metalnes/source/Platform/OSX/CoreAudio.mm

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .mpp .m .M .mm .ixx .cppm .h
  .hh .h++ .hm .hpp .hxx .in .txx .f .F .for .f77 .f90 .f95 .f03 .hip .ispc


CMake Error at CMakeLists.txt:97 (add_executable):
  No SOURCES given to target: MetalNes


CMake Generate step failed.  Build files cannot be regenerated correctly.

[munsie]

Looks like the file is actually in the repo, but just under a different directory. I made a PR that fixes it: #4