discord: Add namespace and cleanup CMakeLists

3rdparty/discord-rpc/src/CMakeLists.txt

@@ -0,0 +1,41 @@
+set(DISCORD_RPC_SOURCES
+  ../include/discord_rpc.h
+  ../include/discord_register.h
+  discord_rpc.cpp
+  rpc_connection.h
+  rpc_connection.cpp
+  serialization.h
+  serialization.cpp
+  connection.h
+  backoff.h
+  msg_queue.h
+)
+
+if(UNIX)
+  list(APPEND DISCORD_RPC_SOURCES connection_unix.cpp)
+  if(APPLE)
+    list(APPEND DISCORD_RPC_SOURCES discord_register_osx.m)
+    add_definitions(-DDISCORD_OSX)
+  else()
+    list(APPEND DISCORD_RPC_SOURCES discord_register_linux.cpp)
+    add_definitions(-DDISCORD_LINUX)
+  endif()
+endif()
+
+if(WIN32)
+  list(APPEND DISCORD_RPC_SOURCES connection_win.cpp discord_register_win.cpp)
+  add_definitions(-DDISCORD_WINDOWS)
+endif()
+
+add_library(discord-rpc STATIC ${DISCORD_RPC_SOURCES})
+
+if(APPLE)
+  target_link_libraries(discord-rpc PRIVATE "-framework AppKit")
+endif()
+
+if(WIN32)
+  target_link_libraries(discord-rpc PRIVATE psapi advapi32)
+endif()
+
+target_include_directories(discord-rpc SYSTEM PRIVATE ${RapidJSON_INCLUDE_DIRS})
+target_include_directories(discord-rpc PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../include)