Fix namespace error of std::source_location under C++20

With C++20 standard, src/corelib/kernel/qproperty.h of Qt Base cannot be
compiled at line 100:

QPropertyBindingSourceLocation(
	const std::experimental::source_location &cppLocation
	)

The reason is that source_location has been merged into namespace std
since C++20, and the header file has also been change from
<experimental/source_location> to <source_location>.

The problem can be avoided by define a constant.

Fixes: QTBUG-93270
Change-Id: I46b4daac6ea20f9623b43746880500d41396afb2
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

0 files changed, 0 insertions, 0 deletions