QPropertyBindingSourceLocation: fix BiC in source_location ctors

Since the class is exported, both ctors from source_location (std and
experimental) need to be in the DLL, otherwise a Qt built with C++20
(using std::source_location) may break C++17 users that, however, have
experimental::source_location (and therefore expect the DLL to export
it).

This is exactly the same issue we had with QPolygon and
QVector::begin() with and w/o QT_STRICT_ITERTORS, therefore the same
fix applies, with the difference that we don't need a separate TU here
to inject the missing symbols, because both versions can be
overloaded.

[ChangeLog][QtCore][QPropertyBindingSourceLocation] (Windows only)
Fixed a binary-incompatibility where source_location constructors were
missing in the ABI.

Pick-to: 6.3 6.2
Change-Id: I4a514565cceea5f92975eff3a3e936efa5f7d8da
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

0 files changed, 0 insertions, 0 deletions