New comment by not-chicken on void-packages repository

https://github.com/void-linux/void-packages/pull/29310#issuecomment-826104337

Comment:
thanks @ericonr 
So the problem is already explained here:  https://github.com/void-linux/void-packages/issues/3605#issuecomment-428780478.
I guess this got triggered here because `nheko` recently picked up `libunwind-devel` as an indirect dependency through `gstreamer1`. 

Now to implement ericonr's fix, we first have to add `configure_args="--enable-cxx-exceptions"` to `libunwind`'s template, since it adds the file containing implementation of `_Unwind_GetIP` only if C++ exceptions are enabled, as seen [here](https://github.com/libunwind/libunwind/blob/master/src/Makefile.am#L125).
And then add something like this to nheko:
```
case "$XBPS_TARGET_MACHINE" in
	armv*-musl) configure_args+=" -DCMAKE_CXX_STANDARD_LIBRARIES=-lunwind" ;;
esac
```