Fix build without the gold linker
    
    The Go runtime silently chose the gold linker on arm and aarch64 build
    targets to work around a binutils bug.
    
    That bug was from 2016, and has been fixed in binutils for a while.  But
    the Go workaround was still in place.
    
    The workaround to choose gold was supposed to error out during the
    configure phase if gold wasn't found - but that doesn't happen.
    
    This leads to builds on aarch64 failing if attempting to compile without
    gold.
    
    Just removing the special condition in the Go source code:
    
    https://go-review.googlesource.com/c/go/+/391115/
    
    works, but that patch is unlikely to be merged upstream.
    
    A patch fixing the build is more likely to be merged:
    
    https://go-review.googlesource.com/c/go/+/366279/
    
    which updates the linker selection to use gold only if available.
    
    References to this bug in upstream Go and Binutils:
    
    https://github.com/golang/go/issues/22040
    https://sourceware.org/bugzilla/show_bug.cgi?id=19962
    
    Including the likely-to-be-merged patch here.