alloc: segfault as expected in strdup()
make: make BSD make the native build glue

It's been fun while it lasted, but BSD make is available on
all sane architectures.  Please use it.
peak: don't need strlcpy/strlcat hack anymore
output: FreeBSD has backtrace() now

Don't forget to link to libexecinfo in that case...
*: a bit more build fixes and assorted stuff