I hate the thing too even though I made it, and rather just get rid of
it. But we can't do that yet. In the meantime, this brings us more
inline with autoconf and will make it slightly easier for me to write a
pkg-config wrapper, which we need.
This reverts commit 0dbc0067604eb9629d1458fcf2b226a88e728f14, reversing
changes made to cb7f7742652acdf3086b3d132163b5ea2c2328eb.
Should go into staging.
Factor a bintools (i.e. binutils / cctools) wrapper out of cc-wrapper. While
only LD is wrapped, the setup hook defines environment variables on behalf of
other utilites.
