MSVC 2019 raises Warning C4619 about C4345 in QVector when compiling with /W4

When including any header that transitively includes <QVector>, a C4619 warning is raised:

D:\ext\Qt\5.12.2\msvc2017_64\include\QtCore\qvector.h(319,12): warning C4619: #pragma warning: there is no warning number '4345' (compiling source file XXX)

The offending line is
```
#ifdef Q_CC_MSVC
// behavior change: an object of POD type constructed with an initializer of the form ()
// will be default-initialized

1. pragma warning ( push )
2. pragma warning ( disable : 4345 )
3. pragma warning(disable : 4127) // conditional expression is constant
   #endif
   ```
    
   Warning 4345 does not exist anymore: https://social.msdn.microsoft.com/Forums/en-US/2a7e65d6-b6fa-4963-b969-8a8d5d5190e8/what-happened-to-warning-c4345-quotbehavior-change-an-object-of-pod-type-constructed-with-an?forum=vclanguage