loader,crypto: fix link error for crypto/internal/boring/sig.StandardCrypto

src/crypto/internal/boring/sig/sig_other.go

@@ -0,0 +1,17 @@
+// Package sig stubs crypto/internal/boring/sig
+package sig
+
+// BoringCrypto indicates that the BoringCrypto module is present.
+func BoringCrypto() {
+
+}
+
+// FIPSOnly indicates that package crypto/tls/fipsonly is present.
+func FIPSOnly() {
+
+}
+
+// StandardCrypto indicates that standard Go crypto is present.
+func StandardCrypto() {
+
+}