message: Disable macOS target for Windows and Linux cross builds by default
diff: @@ -67,7 +67,8 @@ if (ISPC_CROSS)
  option(ISPC_WINDOWS_TARGET "Build ISPC with windows target support" ON)
  option(ISPC_LINUX_TARGET "Build ISPC with linux target support" ON)
  option(ISPC_FREEBSD_TARGET "Build ISPC with freebsd target support" ON)
  - option(ISPC_MACOS_TARGET "Build ISPC with macos target support" ON)
  + # It's possbile to build macOS target on Windows or Linux, but we don't do that by default.
  + option(ISPC_MACOS_TARGET "Build ISPC with macos target support" OFF)
  option(ISPC_IOS_TARGET "Build ISPC with ios target support" ON)
  option(ISPC_ANDROID_TARGET "Build ISPC with android target support" ON)
  option(ISPC_PS4_TARGET "Build ISPC with ps4 target support" ON)
  