randombytes() -> randombytes_buf()

Since randombytes() wraps randombytes_buf(), that's one more function
the linker can strip out until it's actually used by the app.

src/libsodium/crypto_box/curve25519xsalsa20poly1305/ref/keypair_curve25519xsalsa20poly1305.c

@@ -22,6 +22,6 @@ int crypto_box_keypair(
   unsigned char *sk
 )
 {
-  randombytes(sk,32);
+  randombytes_buf(sk,32);
   return crypto_scalarmult_curve25519_base(pk,sk);
 }

src/libsodium/crypto_sign/ed25519/ref10/keypair.c

@@ -32,7 +32,7 @@ int crypto_sign_keypair(unsigned char *pk, unsigned char *sk)
     unsigned char seed[32];
     int           ret;
 
-    randombytes(seed, sizeof seed);
+    randombytes_buf(seed, sizeof seed);
     ret = crypto_sign_seed_keypair(pk, sk, seed);
     sodium_memzero(seed, sizeof seed);
 

src/libsodium/crypto_sign/edwards25519sha512batch/ref/sign_edwards25519sha512batch.c

@@ -13,7 +13,7 @@ int crypto_sign_keypair(
   sc25519 scsk;
   ge25519 gepk;
 
-  randombytes(sk, 32);
+  randombytes_buf(sk, 32);
   crypto_hash_sha512(sk, sk, 32);
   sk[0] &= 248;
   sk[31] &= 127;