sys-boot/grub: fix build error with binutils 2.36

With binutils 2.36, build of grub fails like that:

```
ld: section .note.gnu.property VMA [0000000000400158,0000000000400187]
overlaps section .bss VMA [000000000000e000,000000000041d207]
```

It is caused by assembler, as it generates the GNU property notes section
by default. Use the assmbler option `-mx86-used-note=no` to disable the
section from being generated to workaround the ensuing linker issue.

Patch was originally written by OpenSUSE.

https://sourceware.org/bugzilla/show_bug.cgi?id=27377
https://bugzilla.opensuse.org/show_bug.cgi?id=1181741
https://build.opensuse.org/package/view_file/Base:System/grub2/0001-Fix-build-error-in-binutils-2.36.patch

sdk_container/src/third_party/coreos-overlay/sys-boot/grub/files/grub-2.02-binutils-2.36-x86-used-note.patch

@@ -0,0 +1,47 @@
+From 7801d671905329d28e789082225570fc54fe5784 Mon Sep 17 00:00:00 2001
+From: Michael Chang <mchang@suse.com>
+Date: Fri, 19 Feb 2021 17:40:43 +0800
+Subject: [PATCH] Fix build error in binutils 2.36
+
+The build fails in binutils 2.36
+
+[  520s] cat kernel_syms.lst > syminfo.lst.new
+[  520s] /usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: section .note.gnu.property VMA [0000000000400158,0000000000400187] overlaps section .bss VMA [000000000000f000,000000000041e1af]
+
+It is caused by assembler now generates the GNU property notes section
+by default. Use the assmbler option -mx86-used-note=no to disable the
+section from being generated to workaround the ensuing linker issue.
+
+Signed-off-by: Michael Chang <mchang@suse.com>
+---
+ configure.ac | 14 ++++++++++++++
+ 1 file changed, 14 insertions(+)
+
+diff --git a/configure.ac b/configure.ac
+index c39e8379f..a3fb713ad 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -827,6 +827,20 @@ if ( test "x$target_cpu" = xi386 || test "x$target_cpu" = xx86_64 ) && test "x$p
+   TARGET_CFLAGS="$TARGET_CFLAGS -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow"
+ fi
+ 
++if ( test "x$target_cpu" = xi386 || test "x$target_cpu" = xx86_64 ); then
++  AC_CACHE_CHECK([whether -Wa,-mx86-used-note works], [grub_cv_cc_mx86_used_note], [
++    CFLAGS="$TARGET_CFLAGS -Wa,-mx86-used-note=no -Werror"
++    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
++	[grub_cv_cc_mx86_used_note=yes],
++	[grub_cv_cc_mx86_used_note=no])
++  ])
++
++  if test "x$grub_cv_cc_mx86_used_note" = xyes; then
++    TARGET_CFLAGS="$TARGET_CFLAGS -Wa,-mx86-used-note=no"
++    TARGET_CCASFLAGS="$TARGET_CCASFLAGS -Wa,-mx86-used-note=no"
++  fi
++fi
++
+ # GRUB doesn't use float or doubles at all. Yet some toolchains may decide
+ # that floats are a good fit to run instead of what's written in the code.
+ # Given that floating point unit is disabled (if present to begin with)
+-- 
+2.30.0
+

sdk_container/src/third_party/coreos-overlay/sys-boot/grub/grub-9999.ebuild

@@ -111,12 +111,18 @@ QA_EXECSTACK="usr/bin/grub*-emu* usr/lib/grub/*"
 QA_WX_LOAD="usr/lib/grub/*"
 QA_MULTILIB_PATHS="usr/lib/grub/.*"
 
+PATCHES=(
+	"${FILESDIR}/${PN}-2.02-binutils-2.36-x86-used-note.patch"
+)
+
 src_unpack() {
 	cros-workon_src_unpack
 	default
 }
 
 src_prepare() {
+	default
+
 	sed -i -e /autoreconf/d autogen.sh || die
 
 	if use multislot; then
@@ -132,8 +138,6 @@ src_prepare() {
 		tests/util/grub-fs-tester.in \
 		|| die
 
-	eapply_user
-
 	if [[ -n ${GRUB_AUTOGEN} ]]; then
 		python_setup
 		bash autogen.sh || die