Add --bpf-out-dir argument to control where the final build products land (#13099)

(cherry picked from commit b169d9cfbe)

Co-authored-by: Michael Vines <mvines@gmail.com>

sdk/bpf/scripts/dump.sh

@@ -29,6 +29,11 @@ if ! command -v readelf > /dev/null; then
   exit 1
 fi
 
+set -e
+out_dir=$(dirname "$dump")
+if [[ ! -d $out_dir ]]; then
+  mkdir -p "$out_dir"
+fi
 dump_mangled=$dump.mangled
 
 (

sdk/bpf/scripts/strip.sh

@@ -14,4 +14,10 @@ fi
 bpf_sdk=$(cd "$(dirname "$0")/.." && pwd)
 # shellcheck source=sdk/bpf/env.sh
 source "$bpf_sdk"/env.sh
+
+set -e
+out_dir=$(dirname "$so_stripped")
+if [[ ! -d $out_dir ]]; then
+  mkdir -p "$out_dir"
+fi
 "$bpf_sdk"/dependencies/llvm-native/bin/llvm-objcopy --strip-all "$so" "$so_stripped"