message: CMake: fix macOS build break.
diff: @@ -73,6 +73,10 @@ if (ANDROID OR WEBGL OR IOS OR FILAMENT_USE_SWIFTSHADER)
  set(IS_MOBILE_TARGET TRUE)
  endif()
  +if (NOT ANDROID AND NOT WEBGL AND NOT IOS)
  + set(IS_HOST_PLATFORM TRUE)
  +endif()
  +
  if (IOS)
  # Remove the headerpad_max_install_names linker flag on iOS. It causes warnings when linking
  # executables with bitcode.
  @@ -354,7 +358,7 @@ else()
  endif()
  # By default, link in matdbg for Desktop + Debug only since it pulls in filamat and a web server.
  -if (CMAKE_BUILD_TYPE STREQUAL "Debug" AND NOT IOS AND NOT ANDROID AND NOT WEBGL)
  +if (CMAKE_BUILD_TYPE STREQUAL "Debug" AND IS_HOST_PLATFORM)
  option(FILAMENT_ENABLE_MATDBG "Enable the material debugger" ON)
  else()
  option(FILAMENT_ENABLE_MATDBG "Enable the material debugger" OFF)
  @@ -541,7 +545,7 @@ add_subdirectory(${EXTERNAL}/draco/tnt)
  add_subdirectory(${EXTERNAL}/stb/tnt)
  add_subdirectory(${EXTERNAL}/getopt)
  -if (FILAMENT_BUILD_FILAMAT)
  +if (FILAMENT_BUILD_FILAMAT OR IS_HOST_PLATFORM)
  # spirv-tools must come before filamat, as filamat relies on the presence of the
  # spirv-tools_SOURCE_DIR variable.
  add_subdirectory(${EXTERNAL}/spirv-tools)
  @@ -550,7 +554,7 @@ if (FILAMENT_BUILD_FILAMAT)
  add_subdirectory(${LIBRARIES}/filamat)
  # the material debugger requires filamat
  - if (FILAMENT_ENABLE_MATDBG)
  + if (FILAMENT_ENABLE_MATDBG OR IS_HOST_PLATFORM)
  add_subdirectory(${EXTERNAL}/civetweb/tnt)
  add_subdirectory(${LIBRARIES}/matdbg)
  endif()
  @@ -578,7 +582,7 @@ if (WEBGL)
  add_subdirectory(${EXTERNAL}/imgui/tnt)
  endif()
  -if (NOT ANDROID AND NOT WEBGL AND NOT IOS)
  +if (IS_HOST_PLATFORM)
  add_subdirectory(${LIBRARIES}/bluegl)
  add_subdirectory(${LIBRARIES}/filamentapp)
  add_subdirectory(${LIBRARIES}/filagui)
  