Increase timeout for initial XDP portal session to 2s
It should still fail immediately when the portal isn't available, but
in my test VM with systemd automatically activating the portal when it's
first accessed, it can take 800ms or so. Wait for it instead of falling
back after 200ms.
#error "This is file is not a valid C code"
/* This file contains some of the macros from other header files as
function declarations. This does not make sense in C, but it
provides type information for the dbus-analyze-functions.py
program, which makes these macros callable by DBUS. */