#1384 Deactivate two new clang warnings.

cmake/MoReFEMSettings.cmake

@@ -62,6 +62,8 @@ if(${CMAKE_C_COMPILER_ID} STREQUAL "AppleClang" OR ${CMAKE_C_COMPILER_ID} STREQU
     if (${CMAKE_C_COMPILER_ID} STREQUAL "Clang")
         add_cxx_compiler_flag("-Wno-unused-template")
         add_definitions(-DMOREFEM_LLVM_CLANG)
+        add_cxx_compiler_flag("-Wno-return-std-move")
+        add_cxx_compiler_flag("-Wno-return-std-move-in-c++11")
     endif()
     
     # GOMP is required when sanitizer is used for gcc, but is not known is macOS hence this variable.