CMake: clean up HIDAPI build

CMakeLists.txt

@@ -752,39 +752,9 @@ list(APPEND LIBS ${ICONV_LIBRARIES})
 
 if(NOT ANDROID)
   find_package(HIDAPI)
-  if(HIDAPI_FOUND)
-    message(STATUS "Using shared ${HIDAPI_LIBRARIES} ${HIDAPI_VERSION}")
-    include_directories(${HIDAPI_INCLUDE_DIRS})
-    list(APPEND LIBS ${HIDAPI_LIBRARIES})
-  else()
-    set(HIDAPI_FOUND 1)
-    include_directories(Externals/hidapi/hidapi)
-    if(APPLE)
-      message(STATUS "Using static hidapi from Externals")
-      add_subdirectory(Externals/hidapi/mac)
-      list(APPEND LIBS hidapi)
-    elseif(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
-      find_package(Libudev)
-      if(LIBUDEV_FOUND)
-        message(STATUS "Using static hidapi-hidraw from Externals")
-        add_subdirectory(Externals/hidapi/linux)
-        list(APPEND LIBS hidapi-hidraw udev)
-      else()
-        message(STATUS "Could not find udev, disabling hidapi")
-        set(HIDAPI_FOUND 0)
-      endif()
-    elseif(MSVC)
-      message(STATUS "Using static hidapi-hid from Externals")
-      add_subdirectory(Externals/hidapi/windows)
-      list(APPEND LIBS hidapi-hid)
-    else()
-      message(STATUS "Using static hidapi-libusb from Externals")
-      add_subdirectory(Externals/hidapi/libusb)
-      list(APPEND LIBS hidapi-libusb)
-    endif()
-  endif()
-  if(HIDAPI_FOUND)
-    add_definitions(-DHAVE_HIDAPI=1)
+  if(NOT HIDAPI_FOUND)
+    message(STATUS "Using static HIDAPI from Externals")
+    add_subdirectory(Externals/hidapi EXCLUDE_FROM_ALL)
   endif()
 endif()