Don't force a verbose build.

That was probably something I put in while debugging.  It can be put
back - or added to some other make command - as necessary.

Change-Id: I184a5b8537c43c87844e6e75f65dd3c0accde9ac
Reviewed-on: https://code.wireshark.org/review/5033
Reviewed-by: Guy Harris <guy@alum.mit.edu>