Bump up x11-dl dependency

[czak]

Hi! sdf-test is currently crashing under Linux/X11 due to a bug in x11-dl:

    Finished dev [unoptimized + debuginfo] target(s) in 31.63s
     Running `target/debug/mcsdf-font-tech-demo`
thread 'main' panicked at 'attempted to leave type `std::mem::ManuallyDrop<xlib_xcb::Xlib_xcb>` uninitialized, which is invalid', /home/czak/
.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/mem/mod.rs:666:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I believe it's this or related to this: AltF02/x11-rs#99

Solution

Bump up the x11-dl dependency to the latest version.
The program now builds and runs correctly for me.

Notes

I used an older toolchain 1.40.0 to obtain this diff.
Lockfile format changed in 1.41.0 and was resulting in a huge diff which I didn't want to throw at you :)

[Cierpliwy]

Oh... sorry for not looking at your PR. I almost forgot about Github :) Today I was updating dependencies to preserve a demo on multiple platforms. If you like, you can test if the demo works for you.

[czak]

master builds and runs nicely for me now. No need for this PR anymore. Thanks!