This makes it possible to select CONFIG_CRYPTO_LIB_ARC4 directly. We 
need this to be able to compile this into the kernel and make use of it 
from backports.

--- a/lib/crypto/Kconfig
+++ b/lib/crypto/Kconfig
@@ -6,7 +6,7 @@ config CRYPTO_LIB_AES
 	tristate
 
 config CRYPTO_LIB_ARC4
-	tristate
+	tristate "ARC4 cipher library"
 
 config CRYPTO_ARCH_HAVE_LIB_BLAKE2S
 	tristate