Overhaul compiler to get rid of memory leaks and other bogons.

Overhaul compiler to get rid of memory leaks and other bogons.

Add a memlist to the tokenlist and a function which allocates
with malloc(3) and hangs the piece on the memlist of tokenlist.
At the end of compilation, we ditch everything on the list.

Handle vrt_obj.h like the other #includes, and stuff these
into a vsb instead of directly to a file.

Free decoded token string, if any.

Pull creation and destruction of tokenlist into separate functions
for code clarity.  Remember to destry everything in the tokenlist.

Pull invocation of cc(1) into a separate function and change the
way we do it, so we get any cc(1) groans and whines back in the
vsb so a CLI user will see them.  More errorchecks than before.

More comments throughout.

git-svn-id: svn+ssh://projects.linpro.no/svn/varnish/trunk@1289 d4fa192b-c00b-0410-8231-f00ffab90ce4