rust: drop bindir/libdir patch

I'm honestly not sure what this patch does since everything appears to
build the same with and without it. I did a `tree` of the sysroots and
images and I don't see any file differences. Something like this used to
be necessary in Gentoo but I dropped it a few releases back.

recipes-devtools/rust/rust.inc

@@ -407,7 +407,6 @@ do_configure () {
         "--infodir=${infodir}"              \
         "--mandir=${mandir}"                \
         "--libdir=${libdir}"                \
-        "--bindir=${bindir}"                \
         "--platform-cfg=${WORKDIR}/mk-cfg/" \
         "--enable-local-rust"               \
         "--local-rust-root=${WORKDIR}/${RUST_SNAPSHOT}/rustc" \