nailgun 0.9.1 (new formula)

As per #21880 nailgun was removed because it was woefully outdated and
had moved to a new packaging format. This commit brings the nailgun
formula back from the boneyard and updates it to 0.9.1.

Closes #33068
nailgun: add 0.9.1 bottle.
libsvm 3.19
libsvm: add tools option

Use --with-tools to add the tools that are included in libsvm
libsvm: update 3.19 bottle.