C++11 mode is required, so drop (most) alternatives

core/base/inc/Rtypes.h

core/base/src/TRegexp.cxx

core/base/src/TSystem.cxx

core/meta/inc/TClass.h

core/meta/src/TClass.cxx

core/meta/src/TStreamerElement.cxx

core/metautils/src/TClassEdit.cxx

core/unix/src/TUnixSystem.cxx

io/io/inc/TFile.h

io/io/inc/TStreamerInfo.h

io/io/src/TFile.cxx

io/io/src/TKey.cxx

io/io/src/TStreamerInfo.cxx

tree/tree/inc/TBranchSTL.h

tutorials/roostats/StandardProfileInspectorDemo.C