...found regression e31205f3
"EditUndoRemoveChars::GetStr must return a reference" and dubious code
0e23f7b0 "Lets assume this doesn't want to
update m_pForcedPrefix->GetText() anyway" in addition to the apparent sillies
directly fixed in this commit.

Introduces HAVE_CXX11_REF_QUALIFIER.

Change-Id: I564e98254fd53c1dd9b34193d7057c59721ee24c