Fix persisting wasm dylib on macOS after brew cleanup

lib/base.rb

@@ -59,16 +59,24 @@ def verify_checksum(file)
   end
 
   def install_libwasmvm
-    lib.install "#{buildpath}/libwasmvm.#{determine_libwasmvm_suffix}"
+    libwasmvm_suffix = determine_libwasmvm_suffix
+    libwasmvm_file = "#{buildpath}/libwasmvm.#{libwasmvm_suffix}"
+
+    lib.install libwasmvm_file
   end
 
   def compile_and_install_xiond
     unless OS.mac?
       ENV["LINK_STATICALLY"] = "true"
       ENV["LDFLAGS"] = "-linkmode external -extldflags '-static'"
     end
+
     system "make", "install"
     bin.install "#{ENV.fetch("GOPATH", nil)}/bin/xiond"
+
+    if OS.mac?
+      system "install_name_tool", "-add_rpath", HOMEBREW_PREFIX/"lib", "#{bin}/xiond"
+    end
   end
 
   def determine_libwasmvm_suffix