libunwind-julia fails to build on aarch64

> I've been trying to get julia working on aarch64 but I was running into a

> linker error when guix was trying to build libunwind-julia. I tracked it

> down to the libunwind-julia-fix-GCC10-fno-common.patch not including a fix

> for aarch64 which is included in the upstream commit [1] which fixed this in

> libunwind 1.5.0. I gather libunwind-julia is at 1.3.1 due to julia 1.6.3

> only building against that version, and checking the more recent julia

> versions, it seems julia is only updating it's dependency on libunwind to

> 1.5.0 with julia version 1.8.0 which is only a release candidate at this

> point. So perhaps in the meantime,

> libunwind-julia-fix-GCC10-fno-common.patch could be easily updated so julia

> can start building on aarch64?

>

> [1] https://github.com/libunwind/libunwind/commit/29e17d8d2ccbca07c423e3089a6d5ae8a1c9cb6e

>

> Thanks!

> Akira