Remove m_ctype.h from ndb_global.h and include it (or the relevant
include file) in the file where it's used.
Remove global include of ctype.h

Remove outdated min, max defines
Remove outdated BaseString::snprintf and BaseString::vsnprintf defines,
all platforms now support using C++11 snprintf directly

Change-Id: Ib6cd07b4a3befcc188fc786d19995b5a73ac6178