release v0.11.9

[Freax13]

Notably, this should fix the builds for everyone working on the latest nightly.

[Freax13]

I don't think we'll need a backport for v0.9 because v0.9 doesn't depend on nightly features of x86_64:

$ cargo tree -p bootloader --features binary --edges features
warning: `/data/.cargo/config` is deprecated in favor of `config.toml`
note: if you need to support cargo 1.38 or earlier, you can symlink `config` to `config.toml`
bootloader v0.9.22 (/data)
|-- fixedvec feature "default"
|   `-- fixedvec v0.2.4
|-- rlibc feature "default"
|   `-- rlibc v1.0.0
|-- usize_conversions feature "default"
|   `-- usize_conversions v0.2.0
|-- x86_64 feature "inline_asm"
|   `-- x86_64 v0.14.7
|       |-- bit_field feature "default"
|       |   `-- bit_field v0.10.1
|       |-- bitflags feature "default"
|       |   `-- bitflags v1.2.1
|       `-- volatile feature "default"
|           `-- volatile v0.4.4
|-- x86_64 feature "instructions"
|   `-- x86_64 v0.14.7 (*)
`-- xmas-elf feature "default"
    `-- xmas-elf v0.6.2
        `-- zero feature "default"
            `-- zero v0.1.2
[build-dependencies]
|-- llvm-tools feature "default"
|   `-- llvm-tools v0.1.1
`-- toml feature "default"
    `-- toml v0.5.6
        `-- serde feature "default"
            |-- serde v1.0.116
            `-- serde feature "std"
                `-- serde v1.0.116

[phil-opp]

Thanks!