[Pkg-rust-maintainers] Bug#953285: rust-mach-o-sys fails on architectures with unsigned char

[Daniel Kahn Gillmor]

Package: src:rust-mach-o-sys
Version: 0.1.1-2
Control: affects -1 src:rust-memsec

https://buildd.debian.org/status/package.php?p=rust-mach-o-sys

shows that many debian platforms are failing to build.

The failures mostly look like this:

```
581 | pub const BIND_SPECIAL_DYLIB_FLAT_LOOKUP: ::std::os::raw::c_char = -2;
    |                                                                    ^^ cannot apply unary operator `-`
    |
    = note: unsigned values cannot be negated
```

I think they're happening on platforms where char is unsigned by
default.

Given that mach-o-sys is really intended for the OS X platform, it isn't
surprising that it's failing.

However, this causes memsec to be BD-uninstallable on those same
architectures.

The only reason i can see for having rust-mach-o-sys in debian is for
the ability to cross-compile to MacOS.  But I've never tried to do that,
and maybe it's not actually possible.

Anyway, i'm tempted to carve it out from rust-memsec, since it's only
relevant there:

  https://codesearch.debian.net/search?q=mach.o.sys&literal=0&perpkg=1

If we do carve it out of rust-memsec, we might want to just remove
rust-mach-o-sys from debian until someone has a concrete need for it.

         --dkg
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