cmake: disable warnings for bundled QtSingleApplication

src/app/qtsingleapplication/CMakeLists.txt

@@ -20,6 +20,10 @@ add_library(qtsingleapplication ${QBT_QTSINGLEAPPLICATION_HEADERS} ${QBT_QTSINGL
 target_include_directories(qtsingleapplication INTERFACE "${qtsingleapplication_SOURCE_DIR}")
 target_link_qt_components(qtsingleapplication Network)
 
+if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
+    target_compile_options(qtsingleapplication PRIVATE "-w") # disable warning for 3rdparty code
+endif()
+
 if (GUI)
     target_link_qt_components(qtsingleapplication Widgets)
 endif (GUI)