It need not concern itself with 32-bit dynamic linking; ld-wrapper handles that now.

In preparation for splitting out bintools-wrapper

This avoids any `NIX_FOOBAR=1 1` not triggering conditions.

It means stdin, and is morally equivalent to passing a file. e.g.

  $ echo 'int main(void) { return 0; }' | gcc -x c -

will compile and link a binary.

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.

Shrunk the CC Wrapper documentation so as not to be repetative.

This is more robust for cross-compilation

Also make the code more precise in the process

These will be installed if the wrappers are. The wrappers aren't very
good to install, but that's another matter.

Will need to be editted again to work for cross

…-wrapper

Bintools Wrapper: Init by refactoring out of cc-wrapper, take 2