Remove the #ifdef check just before #undef

No warning is printed anyway. This code is only for one compiler (GCC on
QNX, a.k.a. QCC).

Change-Id: I28d085c72ab5a957146efab0a36c72f213d9d2c3
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Disable all C++11 rvalue refs with Dinkumware C++ library too

Our code assumes that Q_COMPILER_REF_QUALIFIERS implies
Q_COMPILER_RVALUE_REFS. Technically, it should check both macros, but
the only point of ref qualifiers is to have both lvalue- and rvalue-
reference member functions. We might then use std::move without a check
to see if the standard library does provide it.

Change-Id: Ia3eedd298c2218f100aee2e41bdea6e2c5c07a15
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>