Update to upstreamed avr rust

[dylanmckay]

I get this error locally

error: linking with `avr-gcc` failed: exit code: 1
  |
  = note: "avr-gcc" "-Os" "-mmcu=atmega328p" "-T" "lookup-text.ld" "-L" "/home/dylan/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/avr-atmega328p/lib" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.chip8_avr.122g828f-cgu.0.rcgu.o" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.chip8_avr.122g828f-cgu.1.rcgu.o" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.chip8_avr.122g828f-cgu.10.rcgu.o" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.chip8_avr.122g828f-cgu.11.rcgu.o" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.chip8_avr.122g828f-cgu.2.rcgu.o" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.chip8_avr.122g828f-cgu.3.rcgu.o" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.chip8_avr.122g828f-cgu.4.rcgu.o" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.chip8_avr.122g828f-cgu.5.rcgu.o" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.chip8_avr.122g828f-cgu.6.rcgu.o" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.chip8_avr.122g828f-cgu.7.rcgu.o" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.chip8_avr.122g828f-cgu.8.rcgu.o" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.chip8_avr.122g828f-cgu.9.rcgu.o" "-o" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.elf" "-Wl,--gc-sections" "-L" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps" "-L" "/home/dylan/repos/rust-avr-chip8-avr/target/release/deps" "-L" "/home/dylan/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/avr-atmega328p/lib" "-Wl,-Bstatic" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/libchip8_engine-e22d920b1e810129.rlib" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/librustc_std_workspace_core-8bb013930499e942.rlib" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/libcore-f7688596ec6ef2a0.rlib" "/home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/libcompiler_builtins-fd91d00a6345f8c0.rlib" "-Wl,-Bdynamic" "-Wl,--gc-sections" "target/avr-atmega328p/release/deps/rom.o"
  = note: /usr/bin/avr-ld: /home/dylan/repos/rust-avr-chip8-avr/target/avr-atmega328p/release/deps/chip8_avr-3101ca07c6937603.elf section `.text' will not fit in region `text'
          /usr/bin/avr-ld: region `text' overflowed by 1538 bytes
          collect2: error: ld returned 1 exit status

[gergoerdi]

This is lovely, thanks!

However, I'm not quite set up at the moment to try it out. Have you tried running the result on either real hardware, or this simulator?

[dylanmckay]

I have not - but the simulator is a good bet, I will try that.

The linking error is still occurring so this PR isn't ready to be merged yet anyway I think.