Ensure smooth upgrade path from << 2:1.1-2

The new cross compiled packages need to Break/Replace older
versions of golang-go to ensure smooth upgrades.
update changelog
install runtime/cgo into golang-go
delete all obsolete patches
Disable stripping, it breaks go binaries on some architectures
Relicense debian/ under the Go license
emacsen: skip a number of old emacs versions (Thanks Kevin)
Imported Upstream version 1.1.2
Merge tag 'upstream/1.1.2' into debian-sid

Upstream version 1.1.2
update changelog