Add target thumbv7neon-unknown-linux-musleabihf This is a copy of thumbv7neon-unknown-linux-gnueabihf with musl changes merged from armv7-unknown-linux-musleabihf. This appears to have been missed when adding the other ARMv7-A thumb targets.
librustc_target
contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc guide.