f0636d34185d235f51eebaa2ad14c1e6fcaed6c2 depends: zlib: Move toolchain options to configure (Carl Dong)
Pull request description:
```
zlib has its own custom configure script, see comment in zlib.mk for
more details
```
Performed Guix cross-builds locally and everything worked as expected.
ACKs for top commit:
laanwj:
ACK f0636d34185d235f51eebaa2ad14c1e6fcaed6c2
Tree-SHA512: 7ff6114e52a9c49941da31cb0ebd8918b056bf23343790d758e107003d856f3b1f16ebf4ce0ce22e1216a37a610b4c106def3f869d128bfffa61280d45ed6b38