update grub to 2.14

This brings these extra changes:

* eaa3b8f0f Bump version to 2.15
* d38d6a1a9 Release 2.14
* 35bfd6c47 build: Add grub-core/tests/crypto_cipher_mode_vectors.h file to EXTRA_DIST
* ac042f3f5 configure: Print a more helpful error if autoconf-archive is not installed
* e37d02158 kern/ieee1275/openfw: Add a check for invalid partition number
* f94eae0f8 grub-mkimage: Do not generate empty SBAT metadata
* 1aa0dd0c0 configure: Defer check for -mcmodel=large until PIC/PIE checks are done
* ff1edd975 util/grub-mkimagexx: Stop generating unaligned appended signatures
* 51ebc6f67 tests: Add functional tests for ecb/cbc helpers
* caaf50b9a osdep/aros/hostdisk: Fix use-after-free bug during MsgPort deletion
* 18f08826f kern/efi/sb: Enable loading GRUB_FILE_TYPE_CRYPTODISK_ENCRYPTION_KEY and GRUB_FILE_TYPE_CRYPTODISK_DETACHED_HEADER

NOTE: This patch was reversed:

* ac042f3f5 configure: Print a more helpful error if autoconf-archive is not installed

Because it quite unhelpfully broke the build.

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/grub/nvme/patches/0010-Revert-configure-Check-linker-for-image-base-support.patch

@@ -1,7 +1,8 @@
-From 70e4ffed2f1cd9b6871341260cae31a5e68c3081 Mon Sep 17 00:00:00 2001
+From 7b0d621389fc1857c918058f82093f9630ea7730 Mon Sep 17 00:00:00 2001
 From: Leah Rowe <leah@libreboot.org>
 Date: Wed, 24 Dec 2025 01:42:17 +0100
-Subject: [PATCH 1/1] Revert "configure: Check linker for --image-base support"
+Subject: [PATCH 10/10] Revert "configure: Check linker for --image-base
+ support"
 
 This reverts commit 1a5417f39a0ccefcdd5440f2a67f84d2d2e26960.
 ---
@@ -26,7 +27,7 @@ index 70c1912f8..fa7840f09 100644
  void
  cmain (void)
 diff --git a/configure.ac b/configure.ac
-index a282bf7bf..17937baf4 100644
+index d8ca1b7c1..041cfbab4 100644
 --- a/configure.ac
 +++ b/configure.ac
 @@ -1461,6 +1461,7 @@ elif test x$grub_cv_target_cc_link_format = x-mi386pe || test x$grub_cv_target_c
@@ -45,9 +46,9 @@ index a282bf7bf..17937baf4 100644
    TARGET_IMG_CFLAGS=
  fi
  
-@@ -1793,18 +1795,6 @@ LIBS=""
- grub_ASM_USCORE
- grub_PROG_TARGET_CC
+@@ -1798,18 +1800,6 @@ grub_PROG_TARGET_CC
+ m4_ifndef([AX_CHECK_LINK_FLAG], [m4_fatal([autoconf-archive is missing. You must install it to generate the configure script.])])
+ 
  if test "x$TARGET_APPLE_LINKER" != x1 ; then
 -AX_CHECK_LINK_FLAG([-Wl,--image-base,0x400000],
 -    [TARGET_IMG_BASE_LDOPT="-Wl,--image-base"],