sys-boot/grub: update gfxpayload patch for 2.14

Bug: https://bugs.gentoo.org/528826
Signed-off-by: Mike Gilbert <floppym@gentoo.org>

sys-boot/grub/files/grub-2.14-gfxpayload.patch

@@ -0,0 +1,39 @@
+https://bugs.gentoo.org/528826
+http://lists.gnu.org/archive/html/grub-devel/2014-10/msg00031.html
+https://gitlab.freedesktop.org/gnu-grub/grub/-/merge_requests/98
+
+From bcc760dc5de65fe2ae6ed37f68c01fc6a9793484 Mon Sep 17 00:00:00 2001
+From: Mike Gilbert <floppym@gentoo.org>
+Date: Thu, 16 Oct 2014 23:43:51 -0400
+Subject: [PATCH] 10_linux: default gfxpayload=keep only when booting using EFI
+
+A given kernel may be compiled with CONFIG_FB_EFI, but may be booted in
+legacy PC-BIOS mode. It is not safe to set gfxmode=keep under these
+conditions, and this may result in a black screen once the kernel
+starts.
+
+Signed-off-by: Mike Gilbert <floppym@gentoo.org>
+Reviewed-by: Neal Gompa <neal@gompa.dev>
+Reviewed-by: Leo Sandoval <lsandova@redhat.com>
+---
+ util/grub.d/10_linux.in | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
+index 1233b112b..737e1c30c 100644
+--- a/util/grub.d/10_linux.in
++++ b/util/grub.d/10_linux.in
+@@ -118,7 +118,9 @@ linux_entry ()
+       echo "	load_video" | sed "s/^/$submenu_indentation/"
+       if grep -qx "CONFIG_FB_EFI=y" "${config}" 2> /dev/null \
+ 	  && grep -qx "CONFIG_VT_HW_CONSOLE_BINDING=y" "${config}" 2> /dev/null; then
+-	  echo "	set gfxpayload=keep" | sed "s/^/$submenu_indentation/"
++	  echo '	if [ "x$grub_platform" = xefi ]; then' | sed "s/^/$submenu_indentation/"
++	  echo "		set gfxpayload=keep" | sed "s/^/$submenu_indentation/"
++	  echo '	fi' | sed "s/^/$submenu_indentation/"
+       fi
+   else
+       if [ "x$GRUB_GFXPAYLOAD_LINUX" != xtext ]; then
+-- 
+GitLab
+

sys-boot/grub/grub-2.14-r5.ebuild

@@ -182,6 +182,7 @@ src_prepare() {
 	local PATCHES=(
 		"${WORKDIR}/${P}-patches"
 		"${FILESDIR}/${P}-efi_uga.patch"
+		"${FILESDIR}/${P}-gfxpayload.patch"
 	)
 
 	default