Twelve login terminals, root only, console fixes, a faster build, a Niveus splash, and X back on evdev

- tty1-tty12 all run login; the image has only root. /dev/tty7..12 could not
  be written (cdev.c knew minors 10-16 only), which sent their jobs into a
  restart storm that took the supervisor down; fixed, and stat reports them as
  Linux's tty7..12.
- Erasing text at a prompt did nothing: erase_one sent a bare backspace, which
  only moves; it and the echo path now send back-blank-back through vt_feed.
- A white cursor block was left at the end of every line of a verbose boot:
  a line feed at the bottom scrolls the pixels, cursor included, and the
  cursor was erased after the scroll. It comes off first now. A blank cell is
  also marked dirty, which it was not.
- ldlsd died with a general protection fault on real hardware in its variadic
  log function: Linux module code calls with an 8-byte-aligned stack and an
  unset %al, and the prologue's movaps faults. LDLS guest code is built with
  -mstackrealign.
- make iso took over a minute for any change, because staging r8169 rewrote
  the same files and every mtime moved; it now replaces files only if their
  contents differ (about 10 s).
- The loader's splash is redrawn in the boot manager's style, and the boot
  manager shows its cursor whenever a pointer device exists.
- xf86-input-libinput is out of the image again: with it Xorg took both
  keyboard and pointer from libinput and, on the user's laptop, neither worked.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EVRhxi9zpdW2uDUN4FVcao

boot/uefi/main.c

@@ -1063,15 +1063,15 @@ pointer_poll(void)
 }
 
 /* Wait for a key, a click on a key, or the pointer moving onto one.
+ *
+ * The cursor is shown whenever a pointer device is present: hiding it until
+ * something moved left a machine whose pointer sends no events to the
+ * loader with nothing on screen to say a pointer was even looked for.
  *
  * `budget` is a countdown in milliseconds that survives across calls: a
  * caller that returns here after a hover continues the same ten seconds
  * instead of being given a fresh ten. NULL waits for ever.
- *
- * The cursor stays hidden until the pointer has actually done something. The
- * firmware's console layer installs a pointer protocol whether or not a mouse
- * is attached, so "a protocol exists" proves nothing -- and a cursor parked in
- * the middle of the menu of a laptop with no mouse is worse than none. */
+ */
 static int
 wait_event(EFI_INPUT_KEY *key, int *item, UINTN *budget)
 {
@@ -1082,6 +1082,8 @@ wait_event(EFI_INPUT_KEY *key, int *item, UINTN *budget)
         PTR_X = (int)ui_width() / 2;
         PTR_Y = (int)ui_height() / 2;
     }
+    if (have)
+        PTR_ACTIVE = 1;
     ui_cursor(PTR_X, PTR_Y, PTR_ACTIVE);
     for (;;) {
         if (ST->ConIn && !EFI_ERROR(ST->ConIn->ReadKeyStroke(ST->ConIn, key)))
@@ -1094,6 +1096,10 @@ wait_event(EFI_INPUT_KEY *key, int *item, UINTN *budget)
             PTR_RESCANS++;
             pointers_find();
             have = PTR_NREL + PTR_NABS;
+            if (have && !PTR_ACTIVE) {
+                PTR_ACTIVE = 1;
+                ui_cursor(PTR_X, PTR_Y, 1);
+            }
         }
         if (have) {
             int e = pointer_poll();