package/vboot-utils: fix -fno-common build failure

package/vboot-utils: fix -fno-common build failure

Added upstream patch for fixing build failure when using GCC10 as a host
compiler (-fno-common is now default).

Fixes:
http://autobuild.buildroot.net/results/aca662d9fd7052f3b361b731cd266edb3b6c41b0
http://autobuild.buildroot.net/results/6546b284cf306a2fde3c69d67daf9aacffa9e143
http://autobuild.buildroot.net/results/db20bb3c11a1a9558a5d8021015c6915f99097c8

Cc: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>