Fix build

https://bugs.gentoo.org/912853

--- a/3rdparty/libprojectm/CMakeLists.txt
+++ b/3rdparty/libprojectm/CMakeLists.txt
@@ -24,7 +24,7 @@ set(BUILD_PROJECTM_STATIC ON)
 set(DISABLE_NATIVE_PRESETS ON)
 set(DISABLE_MILKDROP_PRESETS OFF)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
 
 pkg_check_modules(GLEW glew)
 
--- a/3rdparty/qtsingleapplication/CMakeLists.txt
+++ b/3rdparty/qtsingleapplication/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.0.0)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=c++0x")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=c++17")
 
 set(SINGLEAPP-SOURCES
     qtlocalpeer.cpp
--- a/ext/libclementine-common/CMakeLists.txt
+++ b/ext/libclementine-common/CMakeLists.txt
@@ -2,7 +2,7 @@ include_directories(${PROTOBUF_INCLUDE_DIRS})
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=c++0x")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=c++17")
 
 set(SOURCES
   core/closure.cpp
--- a/ext/libclementine-remote/CMakeLists.txt
+++ b/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
--- a/ext/libclementine-tagreader/CMakeLists.txt
+++ b/ext/libclementine-tagreader/CMakeLists.txt
@@ -3,7 +3,7 @@ include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 include_directories(${CMAKE_SOURCE_DIR}/ext/libclementine-common)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=c++0x")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=c++17")
 
 set(MESSAGES
   tagreadermessages.proto
--- a/gst/moodbar/CMakeLists.txt
+++ b/gst/moodbar/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.0.0)
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Woverloaded-virtual -Wall --std=c++0x")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Woverloaded-virtual -Wall --std=c++17")
 
 include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})