c++ build times - good news

[Alan Conway <ac...@redhat.com>]

I just figured out that libtool compiles every .cpp file *twice* by
default, once for static libs and once for dynamic. Since we don't use
static libs I've turned off static lib support by default (./configure
--enable-static=yes if you really want it back on) which roughly halves
the build time :)

I've also fixed the problem with parallel builds in the tests dir, so
you can build with -j for additional speedup on SMP boxes.

Cheers,
Alan.