Unbreak consumers on more Unices

[jbeich]

NASM defaults to bin format (e.g. DOS .COM, .SYS). DragonFly, FreeBSD, NetBSD, OpenBSD, Solaris, GNU Hurd and probably more systems use ELF. NASM supports more formats but those are less likely to be supported by Rust and aren't shared on many platforms.

Found via rav1e on FreeBSD x86_64:

$ cargo build
[...]
     Running `/path/to/rav1e/target/debug/build/rav1e-930659fb03421608/build-script-build`
error: failed to run custom build command for `rav1e v0.1.0 (/a/rav1e)`
process didn't exit successfully: `/path/to/rav1e/target/debug/build/rav1e-930659fb03421608/build-script-build` (exit code: 101)
--- stdout
running: "nasm" "" "-g" "-I/path/to/rav1e/target/debug/build/rav1e-bf67f461e7fd7434/out/" "-Isrc/" "/path/to/rav1e/src/x86/ipred.asm" "-o" "/path/to/rav1e/target/debug/build/rav1e-bf67f461e7fd7434/out/src/x86/ipred.o"

--- stderr
/path/to/rav1e/src/x86/ipred.asm:100: error: impossible combination of address sizes
src/ext/x86/x86inc.asm:1424: ... from macro `movdqu' defined here
src/ext/x86/x86inc.asm:1288: ... from macro `RUN_AVX_INSTR' defined here
src/ext/x86/x86inc.asm:1748: ... from macro `vmovdqu' defined here
[...]
thread 'main' panicked at 'nonzero exit status: exit code: 1', /home/foo/.cargo/git/checkouts/nasm-rs-4e8d02e8a0db2eea/7c01c74/src/lib.rs:340:9
note: Run with `RUST_BACKTRACE=1` for a backtrace.

[jbeich]

@tdaede, can you also merge this into your fork as used by rav1e?

[tdaede]

@jbeich I opened a PR for the patch in my fork, once it's merged I'll just point rav1e to this repo.

[jbeich]

@tdaede, #22 got merged >1 week ago. Are you waiting on @medek to push 0.1.4 to crates.io with #21 and #22 or what?

[tdaede]

Whoops, totally forgot. Opened a PR.