PATCH: Install two PCH files instead of one

[Loren James Rittle]

> I noticed you weren't using -include $(path)/stdc++.h. I didn't think
> this worked (although I would certainly prefer it if it did): I thought
> absolute paths only were allowed. Am I confused or doing something wrong?

OK, I see you got it.  I should have mentioned that you had to
manually delete the old targets out of install prefix.

> The other thing I just realized is that all the generated PCH files
> should really be in the target include directory, not the toplevel one.

Fully agreed.  I will fix that issue and commit it.

Regards,
Loren