Add libstd support to Rust BPF (#5788)

sdk/bpf/scripts/install.sh

@@ -116,7 +116,7 @@ if [[ ! -f rust-bpf-$machine-$version.md ]]; then
 fi
 
 # Install Rust-BPF Sysroot sources
-version=v0.8
+version=v0.9
 if [[ ! -f rust-bpf-sysroot-$version.md ]]; then
   (
     set -ex
@@ -134,4 +134,23 @@ if [[ ! -f rust-bpf-sysroot-$version.md ]]; then
   fi
 fi
 
+# Install custom Hashbrown crate needed by Rust-BPF Sysroot
+version=v0.1
+if [[ ! -f hashbrown-$version.md ]]; then
+  (
+    set -ex
+    rm -rf hashbrown*
+    rm -rf xargo
+    cmd="git clone --recursive --single-branch --branch $version https://github.com/solana-labs/hashbrown.git"
+    $cmd
+
+    echo "$cmd" > hashbrown-$version.md
+  )
+  exitcode=$?
+  if [[ $exitcode -ne 0 ]]; then
+    rm -rf hashbrown
+    exit 1
+  fi
+fi
+
 exit 0