Log Message:
rust-bin: update the i586 binaries, so the result works on netbsd-9...

...and probably newer as well.  Testing status on netbsd-8 is unknown
at the moment.   Ref. pkgsrc-users@ discussion; the old binaries
were built on netbsd-8 and require gcc7's shared libs from pkgsrc.
This set is instead cross-built, and does not depend on an external
LLVM or external gcc.

Bump PKGREVISION, since this gets us new i586 binaries.