Replace qrand() engine with C++11 <random> LCG and deprecate

Instead of trying to adapt to whatever the C library may have and using
QThreadLocalStorage, let's use a simple linear congruential generator
engine from <random>. We can't use a single instance because qsrand()
is documented to work per thread.

I thought of using QRandomEngine, but had to make the choice between
growing the QtCore code size and growing the per-thread data size. Code
is sharable and is actually smaller than the sizeof(QRandomEngine),
which is over 2500 bytes. sizeof(std::minstd_rand) is just
sizeof(uint_fast32_t).

Change-Id: I0a103569c81b4711a649fffd14ec8e641d02bf20
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

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