crypto: use pure Go signature implementation in tinygo (#31878)

tinygo is having problems compiling the C implementation

Author: omerfirmak

crypto/signature_cgo.go

@@ -14,8 +14,8 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-//go:build !nacl && !js && !wasip1 && cgo && !gofuzz
-// +build !nacl,!js,!wasip1,cgo,!gofuzz
+//go:build !nacl && !js && !wasip1 && cgo && !gofuzz && !tinygo
+// +build !nacl,!js,!wasip1,cgo,!gofuzz,!tinygo
 
 package crypto
 

crypto/signature_nocgo.go

@@ -14,8 +14,8 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-//go:build nacl || js || wasip1 || !cgo || gofuzz
-// +build nacl js wasip1 !cgo gofuzz
+//go:build nacl || js || wasip1 || !cgo || gofuzz || tinygo
+// +build nacl js wasip1 !cgo gofuzz tinygo
 
 package crypto