move implementation to internal/ directory (#828)

internal/rpc/dataconn/timeoutconn/timeoutconn_readv_unsupported.go

@@ -0,0 +1,12 @@
+//go:build illumos || solaris
+// +build illumos solaris
+
+package timeoutconn
+
+import "net"
+
+func (c *Conn) readv(buffers net.Buffers) (n int64, err error) {
+	// Go does not expose the SYS_READV symbol for Solaris / Illumos - do they have it?
+	// Anyhow, use the fallback
+	return c.readvFallback(buffers)
+}