Tweak dependencies

[Johannesd3]

• Applied latest updates of crypto dependencies (most notably: the crates aes and aes-ctr were unified) but not aes since it requires rust 1.49.
• I realized that the block-modes dependency wasn't used anywhere so I removed it.
• Bumped zerocopy from 0.3 to 0.5. (Needs rust version 1.51)
• Update Cargo.lock
• The latest versions of hyper and libmdns require rust 1.46, and sdl requires 1.48, so I bumped the MSRV.
• Adjusted some lower bounds of the version range to match the functionality we use. Unfortunately I was not able to make rm Cargo.lock && cargo +nightly build -Z minimal-versions work, but it's a step into the right direction.

[roderickvd]

Yes I think the new zerocopy requires an even higher MSRV? Likewise the new sdl2 uses some previously experimental features.

[roderickvd]

While you're at it, there's a new libc too.

[Johannesd3]

We don't use libc anywhere directly?

Let's try MSRV 1.48 next. This is the rustc version of the upcoming debian release.

[roderickvd]

It's here:

librespot/playback/Cargo.toml

Line 33 in cc9d6f5

libc = { version = "0.2", optional = true }

But you're right it's only a dependency for various backends and I think libvorbis so might as well be removed here?

[Johannesd3]

Let's see whether this works

[Johannesd3]

libc was used in the pulseaudio backend but wasn't removed when it wasn't needed anymore: 0411e69

[roderickvd]

I just tried and it's OK to update sdl2 on Rust 1.48:

diff --git a/playback/Cargo.toml b/playback/Cargo.toml
index b8736db..92bfb4a 100644
--- a/playback/Cargo.toml
+++ b/playback/Cargo.toml
@@ -31,7 +31,7 @@ libpulse-binding        = { version = "2", optional = true, default-features = f
 libpulse-simple-binding = { version = "2", optional = true, default-features = false }
 jack            = { version = "0.6", optional = true }
 libc            = { version = "0.2", optional = true }
-sdl2            = { version = "0.34.3", optional = true }
+sdl2            = { version = "0.34", optional = true }
 gstreamer       = { version = "0.16", optional = true }
 gstreamer-app   = { version = "0.16", optional = true }
 glib            = { version = "0.10", optional = true }

[Johannesd3]

0.34.3 means >=0.34.3, <0.35.0 and 0.34 is equivalent to 0.34.0 which means >=0.34.0,<0.35.0. If you look at the Cargo.lock, you'll see that sdl2 is already on 0.34.5.

[roderickvd]

Ah I see, thanks.