Print the rust version when building bpf programs (#16181) (#16183)

(cherry picked from commit abada56ba1)

Co-authored-by: Justin Starry <justin@solana.com>

sdk/bpf/scripts/install.sh

@@ -111,6 +111,7 @@ if [[ ! -e bpf-tools-$version.md || ! -e bpf-tools ]]; then
   fi
   touch bpf-tools-$version.md
   set -ex
+  ./bpf-tools/rust/bin/rustc --version
   ./bpf-tools/rust/bin/rustc --print sysroot
   set +e
   rustup toolchain uninstall bpf