Some glib functions allocate static memory (g_x_error_quark,
g_get_home_dir, etc.).  There is no possibility to free this when glib is
no longer used.  This is mostly an issue when using the glib memory
profiling vtable, because then spurious allocs show up, which means that I
cannot use this information for debugging, which is a pity as the memory
profiling facility is terribly nice.

I would like to have a g_cleanup_everything function or so, to make sure
all memory leaks shown are bugs of my application.  If someone defines the
API, I might implement some of this myself.