grub: Backport const qualifier fix for gcc-5

gcc-5 is stricter and complains about const to non-const
conversions, we backport the patch from upstream into 2.00

Change-Id: I17db365fdd253daaa1ab726e2a70ecad0ac7b2ae
(From OE-Core rev: 7d79a7bfffbc39090b22bb7696cc5dbc832e49b6)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-bsp/grub/files/0001-parse_dhcp_vendor-Add-missing-const-qualifiers.patch

@@ -0,0 +1,33 @@
+Upstream-Status: Backport
+
+Original commit: http://git.savannah.gnu.org/cgit/grub.git/commit/grub-core/net/bootp.c?id=f06c2172c0b32052f22e37523445cf8e7affaea3
+
+From 149d2a14f4723778ced23f439487201ccbf1a2c9 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Thu, 23 Apr 2015 07:03:34 +0000
+Subject: [PATCH] parse_dhcp_vendor: Add missing const qualifiers.
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ grub-core/net/bootp.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/grub-core/net/bootp.c b/grub-core/net/bootp.c
+index bc07d53..44131ed 100644
+--- a/grub-core/net/bootp.c
++++ b/grub-core/net/bootp.c
+@@ -52,9 +52,9 @@ set_env_limn_ro (const char *intername, const char *suffix,
+ }
+ 
+ static void
+-parse_dhcp_vendor (const char *name, void *vend, int limit, int *mask)
++parse_dhcp_vendor (const char *name, const void *vend, int limit, int *mask)
+ {
+-  grub_uint8_t *ptr, *ptr0;
++  const grub_uint8_t *ptr, *ptr0;
+ 
+   ptr = ptr0 = vend;
+ 
+-- 
+2.1.4
+

meta/recipes-bsp/grub/grub2.inc

@@ -25,6 +25,7 @@ SRC_URI = "ftp://ftp.gnu.org/gnu/grub/grub-${PV}.tar.gz \
            file://grub-efi-allow-a-compilation-without-mcmodel-large.patch \
            file://grub-efi-fix-with-glibc-2.20.patch \
            file://0001-Unset-need_charset_alias-when-building-for-musl.patch \
+           file://0001-parse_dhcp_vendor-Add-missing-const-qualifiers.patch \
             "
 
 DEPENDS = "flex-native bison-native xz"