abseil-cpp requires at least C++14

Index: ext/libclementine-remote/CMakeLists.txt
--- ext/libclementine-remote/CMakeLists.txt.orig
+++ ext/libclementine-remote/CMakeLists.txt
@@ -1,6 +1,6 @@
 include_directories(${PROTOBUF_INCLUDE_DIRS})
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=c++0x")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=c++17")
 
 set(MESSAGES
   remotecontrolmessages.proto
