Updating rust to 1.68.1?

[Havard Eidnes <he%NetBSD.org@localhost>]

Hi,

it's time again.  pkgsrc-wip rust is already at this version, and
these are the tests I've been doing with either 1.68.0 or 1.68.1:

OK      OS      version         CPU                     test

x NetBSD        10              amd64 -> i386           cross-build
x NetBSD        10              amd64 -> ppc (8.0)      cross-build
x NetBSD        10              amd64 -> ppc (>=9.0)    cross-build
x NetBSD        10              amd64 -> armv6          cross-build
x NetBSD        10              amd64 -> armv7          cross-build
x NetBSD        10              amd64 -> aarch64        cross-build
x NetBSD        10              amd64 -> aarch64_be     cross-build
x NetBSD        10              amd64 -> sparc64        cross-build
x NetBSD        10              amd64 -> mipsel         cross-build
x NetBSD        10              amd64                   native-build
x NetBSD        10              amd64                   librsvg
x NetBSD        10              amd64                   firefox
x NetBSD        10              amd64                   firefox-run
x NetBSD        10              ppc                     native-build
x NetBSD        10              ppc                     librsvg
x NetBSD        10              sparc64 / internal-llvm native-build
x NetBSD        10              sparc64 / internal-llvm librsvg
n NetBSD        10              sparc64 / llvm-14       native-build
n NetBSD        10              sparc64 / llvm-14       librsvg
n NetBSD        9               sparc64                 native-build
n NetBSD        9               sparc64                 librsvg
x NetBSD        9               amd64 / llvm-15         native-build
x NetBSD        9               amd64 / llvm-15         librsvg
x NetBSD        9               amd64 / llvm-15         firefox
x NetBSD        9               amd64 / llvm-15         firefox-run
x NetBSD        9               i386 / llvm-15          native-build
x NetBSD        9               i386 / llvm-15          librsvg
x NetBSD        9               i386 / llvm-15          firefox
x NetBSD        9               i386 / llvm-15          firefox-run
x NetBSD        9               aarch64 / llvm-14       native-build
x NetBSD        9               aarch64 / llvm-14       librsvg
x NetBSD        9               aarch64 / llvm-14       firefox
x NetBSD        9               earmv7hf-el / llvm-14   native-build
x NetBSD        9               earmv7hf-el / llvm-14   librsvg
x NetBSD        8               i386 / llvm-14          native-build
x NetBSD        8               i386 / llvm-14          librsvg

Some sparc64 variants are marked "n" because libunwind doesn't
build on that, but it succeeds using the internal LLVM instead,
something the build now defaults to on that platform.

Any objections?

Regards,

- Håvard