grub2: update to newer version

In order to support PXE-EFI64 booting we need a more up to date
version of GRUB2.

This patch moves the GRUB version to 2.02~beta2+e4a1fe391.

The e4a1fe391 refers to the git hash from the master grub repo:
  git clone git://git.savannah.gnu.org/grub.git

The 2.02~beta2 release did not work so we moved to the latest
available.

Two minor patches are added on top:

version-string.patch:
change the version string to "2.02~beta2+e4a1fe391"

set-default-graphics-mode-to-text.patch:
For EFI64 set the default graphics mode to text

patches/grub/series

@@ -0,0 +1,3 @@
+# This series applies on GIT commit 6f2068a6c21dc22f4b131a3882c2eb84c0d9aa61
+version-string.patch
+set-default-graphics-mode-to-text.patch

patches/grub/set-default-graphics-mode-to-text.patch

@@ -0,0 +1,22 @@
+set default graphics mode to text
+
+For EFI set the default graphics mode to text.
+
+This supresses an ugly, but harmless message about no video mode
+found.
+
+diff --git a/grub-core/loader/i386/linux.c b/grub-core/loader/i386/linux.c
+index 31fb91e..b1f34f8 100644
+--- a/grub-core/loader/i386/linux.c
++++ b/grub-core/loader/i386/linux.c
+@@ -45,8 +45,8 @@ GRUB_MOD_LICENSE ("GPLv3+");
+ #ifdef GRUB_MACHINE_EFI
+ #include <grub/efi/efi.h>
+ #define HAS_VGA_TEXT 0
+-#define DEFAULT_VIDEO_MODE "auto"
+-#define ACCEPTS_PURE_TEXT 0
++#define DEFAULT_VIDEO_MODE "text"
++#define ACCEPTS_PURE_TEXT 1
+ #elif defined (GRUB_MACHINE_IEEE1275)
+ #include <grub/ieee1275/ieee1275.h>
+ #define HAS_VGA_TEXT 0

patches/grub/version-string.patch

@@ -0,0 +1,20 @@
+patch-version-string
+
+Add the git hash from which this release is based to the end of the
+existing GRUB version string.
+
+This differentiates it from other releases that do not work.
+
+diff --git a/configure.ac b/configure.ac
+index 8888c2f..9614256 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -31,7 +31,7 @@ dnl (such as BUILD_CC, BUILD_CFLAGS, etc.) for the build type and variables
+ dnl with the prefix "TARGET_" (such as TARGET_CC, TARGET_CFLAGS, etc.) are
+ dnl used for the target type. See INSTALL for full list of variables.
+
+-AC_INIT([GRUB],[2.02~beta2],[[email protected]])
++AC_INIT([GRUB],[2.02~beta2+e4a1fe391],[[email protected]])
+
+ AC_CONFIG_AUX_DIR([build-aux])
+

upstream/grub-e4a1fe391.tar.xz.sha1

@@ -0,0 +1 @@
+b3f68822f4809e8113c0686f8d50b509f7f7df8b  grub-e4a1fe391.tar.xz