cmd/availdevs always rebuilds
make ; make
Note that it always rebuilds. "make -d" says it's because the command changed.
This has to do with the conditional assignment of LDLIBS
all install := LDLIBS += -lxml2
(which is an unfortunate practice, given how it causes problems like this).
That was apparently done originally because we didn't have a lint lib for xml2.
No longer relevant now that we don't run lint anymore.