Fix compilation on macOs (#2613)

Author: iamluc

compile_rust.sh

@@ -9,4 +9,10 @@ if test -n "$SHARED"; then
   RUSTFLAGS="$RUSTFLAGS --cfg php_shared_build"
 fi
 
+case "${host_os}" in
+  darwin*)
+    RUSTFLAGS="$RUSTFLAGS -Clink-arg=-undefined -Clink-arg=dynamic_lookup";
+    ;;
+esac
+
 RUSTFLAGS="$RUSTFLAGS" RUSTC_BOOTSTRAP=1 "${DDTRACE_CARGO:-cargo}" build $(test "${PROFILE:-debug}" = "debug" || echo --profile "$PROFILE") "$@"