win32: strip UNC prefix if present

src/lfs.c

@@ -953,6 +953,12 @@ static int push_link_target(lua_State *L) {
               break;
             }
             if (tsize < size) {
+#ifdef _WIN32
+              if (tsize > 4 && strncmp(target, "\\\\?\\", 4) == 0) {
+                memmove_s(target, tsize - 3, target + 4, tsize - 3);
+                tsize -= 4;
+              }
+#endif
               ok = 1;
               break;
             }