Move the implementation of normalizeTypeInternal()

Move the implementation of normalizeTypeInternal()

This function is only used in src/tools/moc/moc.cpp and
src/corelib/kernel/qmetaobject.cpp. We don't need to include the
static, non-inline declaration and definition every time
qmetaobject_p.h is included.

This also silences the related warning from clang:

../../../include/QtCore/5.0.0/QtCore/private/../../../../../src/corelib/kernel/qmetaobject_p.h:171:19: error:
      function 'normalizeTypeInternal' is not needed and will not be emitted
      [-Werror,-Wunneeded-internal-declaration]
static QByteArray normalizeTypeInternal(const char *t, const char *e, ...
                  ^

Change-Id: I6dfb2cb4d9d82a2ae7795f91169aa62f9a5f2c2f
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>