add special case for pkg-config-for target, since there's TWO pkg-config-for-targets, and they both get loaded, and in the module system it's just down to putting the right one last

return a combinator from repo->combinator, so the final package set can refer to the output spur's self.

and some random changes

one special case for pkg-config, since it's a macro

partially working fixpoint, packages with 0 dependencies outside their own module can now build, need to find what symbols were formerly from module imports