lang/rust: Update to 1.37.0

[tobik]

Summary

Scheduled to be released on Thursday 2019-08-15.

https://internals.rust-lang.org/t/1-37-prerelease-testing/10701
https://github.com/rust-lang/rust/blob/stable/RELEASES.md

Test Plan

Builds fine on 11.2/amd64 by @jbeich. Consumers ok too.
Builds fine on 12.0/amd64. Consumers ok too.
Builds fine on 11.2/i386. Consumers ok too.
Builds fine on 13.0/aarch64 per @greg_unrelenting.technology (thanks!). ripgrep ok.

As always a test build on tier 2 archs would be appreciated, @pkubaj, @mikael.urankar_gmail.com.

We should check that it does not suffer from the same problem as PR 239785 since the git2 crate seems to have been updated to 0.9.1... It seems to work fine.

[mikael]

I don't have access to my arm boards.

[tobik]

In D21247#461898, @mikael.urankar_gmail.com wrote:

I don't have access to my arm boards.

Ok. Should we postpone the update a couple of days? Or no access to them for a longer time?

[mikael]

In D21247#461925, @tobik wrote:

In D21247#461898, @mikael.urankar_gmail.com wrote:

I don't have access to my arm boards.

Ok. Should we postpone the update a couple of days? Or no access to them for a longer time?

Don't wait for me, I'll have access to them next week but will be busy with other stuff.

[tobik]

@jbeich www/firefox-esr fails to build due to #![deny(warnings)] and the new default bare_trait_objects warning. See P296:

   Compiling webrender_bindings v0.1.0 (/wrkdirs/usr/ports/www/firefox-esr/work/firefox-60.8.0/gfx/webrender_bindings)
	error: trait objects without an explicit `dyn` are deprecated
	   --> gfx/webrender_bindings/src/bindings.rs:471:28
	    |
	471 |     fn clone(&self) -> Box<RenderNotifier> {
	    |                            ^^^^^^^^^^^^^^ help: use `dyn`: `dyn RenderNotifier`
	    |
	note: lint level defined here
	   --> gfx/webrender_bindings/src/lib.rs:5:9
	    |
	5   | #![deny(warnings)]
	    |         ^^^^^^^^
	    = note: #[deny(bare_trait_objects)] implied by #[deny(warnings)]
	
	error: trait objects without an explicit `dyn` are deprecated
	   --> gfx/webrender_bindings/src/bindings.rs:736:30
	    |
	736 |     let recorder: Option<Box<ApiRecordingReceiver>> = if unsafe { gfx_use_wrench() } {
	    |                              ^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn ApiRecordingReceiver`
	
	error: trait objects without an explicit `dyn` are deprecated
	  --> gfx/webrender_bindings/src/moz2d_renderer.rs:98:28
	   |
	98 |                resources: &BlobImageResources,
	   |                            ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn BlobImageResources`
	
	error: trait objects without an explicit `dyn` are deprecated
	   --> gfx/webrender_bindings/src/moz2d_renderer.rs:136:65
	    |
	136 |         fn process_fonts(mut extra_data: BufReader, resources: &BlobImageResources) {
	    |                                                                 ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn BlobImageResources`
	
	error: aborting due to 4 previous errors

In D21247#462034, @mikael.urankar_gmail.com wrote:

Don't wait for me, I'll have access to them next week but will be busy with other stuff.

Alright, we'll deal with potential build problems afterwards then.

[val_packett.cool]

I'm building on aarch64 right now, llvm is done, so I'm expecting success

[val_packett.cool]

Builds fine on aarch64 CURRENT, tested building ripgrep with it, fine.

[jbeich]

In D21247#462065, @tobik wrote:

@jbeich www/firefox-esr fails to build due to #![deny(warnings)] and the new default bare_trait_objects warning. See P296:

Fixed in rP508892.

[tobik]

• Add cargo.mk and revision bumps