csu: add crtbrand.o dependency on sys/param.h

[emaste]

Summary

__FreeBSD_version is recorded in *crt1.o and crti.o via crtbrand.o. Add an explicit dependency to pick up __FreeBSD_version bumps.

[emaste]

@jhb notes there's no dependency on *crt1.o, so more would be needed to make this work.

[jrtc27]

What about if you just add the various .o files to DEPENDOBJS, to deal with the fact that doesn't happen automatically for FILES?

[imp]

Won't this force a relink, at least in meta mode, of all world's binaries?