When cross compiling macos → dragonfly the dist build fails in the
proc-maro-test-impl crate with the following error:
ld: unknown option: -z\nclang: error: linker command failed with
exit code 1 (use -v to see invocation)
This appears to be a wart stemming from using an Apple host for cross
compiling. Passing the target along to cargo allows it to pick up
a linker that it understands and DTRT.
c5d4f7339a