cunative: Only pull in native deps with a tag (#211)

* cunative: Only pull in native deps with a tag

* only run decode_snap_test with cunative tag

Makefile

@@ -80,6 +80,7 @@ deps: $(BUILD_DEPS)
 
 ## ldflags -s -w strips binary
 
+curio: GOFLAGS+=-tags=cunative
 curio: $(BUILD_DEPS)
 	rm -f curio
 	GOAMD64=v3 CGO_LDFLAGS_ALLOW=$(CGO_LDFLAGS_ALLOW) $(GOCC) build $(GOFLAGS) -o curio -ldflags " -s -w \

lib/ffi/cunative/decode_sdr.go

@@ -1,3 +1,5 @@
+//go:build cunative
+
 package cunative
 
 /*

lib/ffi/cunative/decode_snap.go

@@ -1,3 +1,5 @@
+//go:build cunative
+
 package cunative
 
 /*

lib/ffi/cunative/decode_snap_test.go

@@ -1,3 +1,5 @@
+//go:build cunative
+
 package cunative
 
 import (

lib/ffi/cunative/decode_test.go

@@ -1,3 +1,5 @@
+//go:build cunative
+
 package cunative
 
 import (

lib/ffi/cunative/nonative.go

@@ -0,0 +1,19 @@
+//go:build !cunative
+
+package cunative
+
+import (
+	"io"
+
+	"github.com/ipfs/go-cid"
+
+	"github.com/filecoin-project/go-state-types/abi"
+)
+
+func DecodeSnap(spt abi.RegisteredSealProof, commD, commK cid.Cid, key, replica io.Reader, out io.Writer) error {
+	panic("DecodeSnap: cunative build tag not enabled")
+}
+
+func Decode(replica, key io.Reader, out io.Writer) error {
+	panic("Decode: cunative build tag not enabled")
+}