libunwind: enable it to all targets
This commit will enable building for riscv64
and maybe for other platforms such as mipsel64.
Suggested-by: Rosen Penev <[email protected]>
in https://github.com/openwrt/openwrt/pull/3871#issuecomment-778987028
Signed-off-by: Josef Schlehofer <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20193
Signed-off-by: Hauke Mehrtens <[email protected]>