docs: add notes on DLL deps

docs/index.html

@@ -161,6 +161,27 @@
         and pthreads (<a href="https://mingw-w64.sourceforge.io/">winpthreads</a>)
         are always available.
     </p>
+    <p>
+        When building shared libraries, there are several approaches to
+        recursively finding DLL dependencies (alphabetical list):
+    </p>
+        <ul>
+        <li>
+            <a href="https://github.com/desertbit/gml/blob/master/cmd/gml-copy-dlls/main.go">
+            go script</a>
+        </li>
+        <li>
+            <a href="https://github.com/gsauthof/pe-util">pe-util</a>
+            packaged with
+            <a href="https://github.com/mxe/mxe/blob/master/src/pe-util.mk">mxe</a>
+        </li>
+        <li>
+            <a href="https://github.com/mxe/mxe/blob/master/tools/copydlldeps.py">python script</a>
+        </li>
+        <li>
+            <a href="https://github.com/mxe/mxe/blob/master/tools/copydlldeps.md">shell script</a>
+        </li>
+        </ul>
     <p>
         Experimental support for GCC with posix threads was
         added in <a href="https://github.com/mxe/mxe/pull/958">November 2015</a>. Since <a href="https://github.com/mxe/mxe/pull/2263">January 2019</a> it is used by default.