Discord Rich Presence CMake integration

I have no idea if this works or not. Hopefully the build bot will tell me.

Externals/discord-rpc/CMakeLists.txt

@@ -3,11 +3,8 @@ project (DiscordRPC)
 
 include(GNUInstallDirs)
 
-option(BUILD_EXAMPLES "Build example apps" ON)
-
 # format
 file(GLOB_RECURSE ALL_SOURCE_FILES
-    examples/*.cpp examples/*.h examples/*.c
     include/*.h
     src/*.cpp src/*.h src/*.c
 )
@@ -26,31 +23,6 @@ if (CLANG_FORMAT_CMD)
     )
 endif(CLANG_FORMAT_CMD)
 
-# thirdparty stuff
-execute_process(
-    COMMAND mkdir ${CMAKE_CURRENT_SOURCE_DIR}/thirdparty
-    ERROR_QUIET
-)
-
-find_file(RAPIDJSONTEST NAMES rapidjson rapidjson-1.1.0 PATHS ${CMAKE_CURRENT_SOURCE_DIR}/thirdparty CMAKE_FIND_ROOT_PATH_BOTH)
-if (NOT RAPIDJSONTEST)
-    message("no rapidjson, download")
-    set(RJ_TAR_FILE ${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/v1.1.0.tar.gz)
-    file(DOWNLOAD https://github.com/miloyip/rapidjson/archive/v1.1.0.tar.gz ${RJ_TAR_FILE})
-    execute_process(
-        COMMAND ${CMAKE_COMMAND} -E tar xzf ${RJ_TAR_FILE}
-        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/thirdparty
-    )
-    file(REMOVE ${RJ_TAR_FILE})
-endif(NOT RAPIDJSONTEST)
-
-find_file(RAPIDJSON NAMES rapidjson rapidjson-1.1.0 PATHS ${CMAKE_CURRENT_SOURCE_DIR}/thirdparty CMAKE_FIND_ROOT_PATH_BOTH)
-
-add_library(rapidjson STATIC IMPORTED ${RAPIDJSON})
-
 # add subdirs
 
 add_subdirectory(src)
-if (BUILD_EXAMPLES)
-    add_subdirectory(examples/send-presence)
-endif(BUILD_EXAMPLES)

Externals/discord-rpc/src/CMakeLists.txt

@@ -1,4 +1,4 @@
-include_directories(${PROJECT_SOURCE_DIR}/include)
+include_directories(${PROJECT_SOURCE_DIR}/include ${PROJECT_SOURCE_DIR}/thirdparty/include)
 
 option(ENABLE_IO_THREAD "Start up a separate I/O thread, otherwise I'd need to call an update function" ON)
 option(USE_STATIC_CRT "Use /MT[d] for dynamic library" OFF)