Build fail in cross compile environments

[leighmcculloch]

running: go build -trimpath -o dist/horizon-snapshot-darwin-amd64/horizon github.com/stellar/go/services/horizon" pid=2976
github.com/stellar/go-stellar-xdr-json/xdr2json: build constraints exclude all Go files in /home/runner/go/pkg/mod/github.com/stellar/go-stellar-xdr-json@v0.0.0-20250203230501-c6fa0788fe99/xdr2json

Ref: https://github.com/stellar/go/actions/runs/13320223647/job/37203313353?pr=5604