libunwind: Backport a fix for -fno-common option to compile

[Khem Raj]
defaults for gcc is to use -fno-common this ensures that it keeps
building with gcc -fno-common

Fixes
src/arm/Ginit.c:60: multiple definition of `_U_dyn_info_list'; mi/.libs/dyn-info-list.o:/usr/src/debug/libunwind/1.4.0-r0/build/src/../../libunwind-1.4.0/src/mi/dyn-info-list.c:28: first defined here

[Philippe Coval]

Change and related patch ported to dunfell branch on 1.3.1 version

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Origin: https://github.com/openembedded/openembedded-core/commit/6cd2cf6525bcb241b3a2538e559fcef2a2084a7e


Signed-off-by: Philippe Coval <philippe.coval@huawei.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>