Conflicting implementations of trait platform::platform::x11::util::format::Formattable for type u8

[UK992]

error[E0119]: conflicting implementations of trait `platform::platform::x11::util::format::Formattable` for type `u8`:
  --> /home/servo/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.16.0/src/platform/linux/x11/util/format.rs:54:1
   |
53 | impl Formattable for c_char { const FORMAT: Format = Format::Char; }
   | --------------------------- first implementation here
54 | impl Formattable for c_uchar { const FORMAT: Format = Format::Char; }
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `u8`

In servo/servo#21087 (comment) on targets arm-unknown-linux-gnueabihf and aarch64-unknown-linux-gnu.

[francesca64]

Is this good? #586

I never considered that c_char could be unsigned, though fortunately I doubt my oversight causes any unsoundness.

Are those targets easy to add to CI?

[UK992]

PR Looking good to me.

[francesca64]

I'm guessing you'll want a release?

[UK992]

Yes.

[francesca64]

#587

[UK992]

Thank you :)