Fix "make distcheck."

src/lib/crypt_ops/include.am

@@ -54,6 +54,7 @@ noinst_HEADERS +=					\
 	src/lib/crypt_ops/crypto_cipher.h		\
 	src/lib/crypt_ops/crypto_hkdf.h			\
 	src/lib/crypt_ops/crypto_init.h			\
+	src/lib/crypt_ops/crypto_nss_mgt.h		\
 	src/lib/crypt_ops/crypto_openssl_mgt.h		\
 	src/lib/crypt_ops/crypto_pwbox.h		\
 	src/lib/crypt_ops/crypto_rand.h			\