buildRustCrate: pass link flags when building libraries

With Rust 1.61, it is necessary to link to external static/dynamic libaries
when building the rlib that uses them, rather than when linking the final
binary. In fact, it is no longer necessary to specify the libraries to link
when building the final binary, but the library search path flags must still
be included.

pkgs/build-support/rust/build-rust-crate/lib.sh

@@ -16,6 +16,7 @@ build_lib() {
     --out-dir target/lib \
     -L dependency=target/deps \
     --cap-lints allow \
+    $LINK \
     $LIB_RUSTC_OPTS \
     $BUILD_OUT_DIR \
     $EXTRA_BUILD \
@@ -97,7 +98,6 @@ setup_link_paths() {
      if [[ ! -z "$i" ]]; then
        for library in $i; do
          echo "-l $library" >> target/link
-         echo "-l $library" >> target/link.final
        done
      fi
   done