Fix mach_port_t not being found

Fixes errors like
In file included from
qtbase/include/QtCore/6.4.0/QtCore/private/qcore_mac_p.h:1:
qtbase/src/corelib/kernel/qcore_mac_p.h:61:9:
error: unknown type name 'mach_port_t'

Amends e05300163e

Pick-to: 6.2 6.3
Change-Id: I8f4c579e9b8ef187859497361c4e126a486a543c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

src/corelib/kernel/qcore_mac_p.h

@@ -56,6 +56,7 @@
 #include <QtCore/qoperatingsystemversion.h>
 
 #ifdef Q_OS_MACOS
+#include <mach/port.h>
 struct mach_header;
 typedef int kern_return_t;
 typedef mach_port_t io_object_t;