[dylink] Normalize library paths to prevent duplicate loading

When a shared library in a subdirectory references a dependency via
$ORIGIN/.. rpath, findLibraryFS resolves it to a non-canonical path
containing ".." (e.g. "sub/../lib.so"). Since loadDynamicLibrary uses
the raw path as the LDSO key, this causes the same library to be loaded
twice under different names, running constructors twice.

Fix by normalizing libName with PATH.normalize() at the top of
loadDynamicLibrary, matching what dlopenInternal already does.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: pepijndevos

src/lib/libdylink.js

@@ -1103,6 +1103,8 @@ var LibraryDylink = {
      * @param {Object=} localScope
      */`,
   $loadDynamicLibrary: function(libName, flags = {global: true, nodelete: true}, localScope, handle) {
+    // Avoid duplicate LDSO entries from non-canonical paths (e.g. "sub/../lib.so")
+    libName = PATH.normalize(libName);
 #if DYLINK_DEBUG
     dbg(`loadDynamicLibrary: ${libName} handle: ${handle}`);
     dbg('existing:', Object.keys(LDSO.loadedLibsByName));