Fix name of tarball based on GOARCH
Fix name of tarball based on GOARCH

If the GOARCH environment variable is defined, use it as the arch
for the name of the tarball produced in build/dist/

Signed-off-by: Samuel Verschelde <62565ede1067dc51e398e0b5c0fecb48dc8e3546@ylix.fr>

xenserver/xe-guest-utilities,xenserver/xe-guest-utilities,xenserver/xe-guest-utilities