message: Fix compilation on mac
diff: ['OS=="mac"', {
  "xcode_settings": {
  "CLANG_CXX_LIBRARY": "libc++",
  - "CLANG_CXX_LANGUAGE_STANDARD": "c++17"
  + "CLANG_CXX_LANGUAGE_STANDARD": "c++17",
  + "OTHER_CFLAGS": [ "-Wno-aligned-allocation-unavailable","-march=native"]
  },
  "include_dirs": [ "media-server/ext/crc32c/config/Darwin-i386" ],
  - "cflags_cc": [ "-Wno-aligned-allocation-availability" ]
  }],
  ['OS=="linux"',{
  "conditions" : [["target_arch=='x64'",{
  ['OS=="linux"', {
  "ldflags" : [" -Wl,-Bsymbolic "],
  }],
  + ['OS=="mac"', {
  + "xcode_settings": {
  + "CLANG_CXX_LIBRARY": "libc++",
  + "CLANG_CXX_LANGUAGE_STANDARD": "c++17",
  + "OTHER_CFLAGS": [ "-Wno-aligned-allocation-unavailable","-march=native"]
  + },
  + }],
  ]
  }
  ]
  