Profile include support

[Sam Hartman]

Greg, I'm sorry to be difficult, but I believe I may have discovered an
additional requirement for this package.

Debian and Redhat both support 64-bit and 32-bit binaries; I believe
Solaris is in the same boat.  To do this,you need to have the right
plugin for the architecture in question.  We're going to need some
mechanism for handling that.  I can see a couple of options:

1) Allow some architecture specific directory such as libdirto be substituted into
profile include statements.

2) Allow some architecture specific directory to be substituted into
plugin paths.

3) Have plugin paths relative to libdir.

If we pick option 1 it would affect your current project.

I have read the issues you bring up and don't have strong opinions.  I'd
probably recommend glob should be optional and that without it only
explicit paths can be included.

--Sam