Qt5 uses QT_HAS_INCLUDE (which maps to __has_include), and uses it
to guard #include <chrono>. Clang's -frewrite-includes, which icecream
uses for distributing source to remote nodes, for some reason doesn't
recognize __has_include properly when wrapped by this macro, and this
all results in strange compile errors related to std::chrono.

Change-Id: Ia375ebd928b40ebd51ab4cc59488f3b62939e039
Reviewed-on: https://gerrit.libreoffice.org/65506
Tested-by: Jenkins
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>