Size conversion warning using QSet<> initializer_list ctor

On 64-bit MSVC compilations, when using the QSet<> initializer list constructor, size conversion warnings are emitted.

This is because std::initializer_list<>::size() returns the size_t type, whereas the QSet<>::reserve method takes an int.

#include <QCoreApplication>

#include <QSet>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QSet<int> list = {1, 2, 3, 4};  // CONFIG += c++11

    return a.exec();
}

Output:

c:\qt\qt5.3.2\5.3\msvc2013_64\include\qtcore\qset.h(63) : warning C4267: 'argument' : conversion from 'size_t' to 'int', possible loss of data
c:\qt\qt5.3.2\5.3\msvc2013_64\include\qtcore\qset.h(61) : while compiling class template member function 'QSet<int>::QSet(std::initializer_list<T>)'
with
[
T=int
]
..\TestWarnings\main.cpp(9) : see reference to function template instantiation 'QSet<int>::QSet(std::initializer_list<T>)' being compiled
with
[
T=int
]
..\TestWarnings\main.cpp(9) : see reference to class template instantiation 'QSet<int>' being compiled