Enable -Wreturn-std-move

commit_hash:c7f0699a8f585dc8140bded7a65b017808bebb38

build/ymake_conf.py

@@ -1551,7 +1551,6 @@ class GnuCompiler(Compiler):
                 '-Wno-deprecated-enum-float-conversion',
                 '-Wno-deprecated-volatile',
                 '-Wno-pessimizing-move',
-                '-Wno-return-std-move',
                 '-Wno-undefined-var-template',
             ]