MAINT-5100 Fixed viewer not finding sky files at login

indra/llvfs/lldiriterator.cpp

@@ -51,7 +51,11 @@ class LLDirIterator::Impl
 LLDirIterator::Impl::Impl(const std::string &dirname, const std::string &mask)
 	: mIsValid(false)
 {
+#ifdef LL_WINDOWS // or BOOST_WINDOWS_API
+	fs::path dir_path(utf8str_to_utf16str(dirname));
+#else
 	fs::path dir_path(dirname);
+#endif
 
 	bool is_dir = false;