Let crypto_generichash_statebytes() return a size rounded to the alignment

Add similar check in the aead_aes256gcm test.

src/libsodium/crypto_generichash/crypto_generichash.c

@@ -46,7 +46,7 @@ crypto_generichash_primitive(void)
 size_t
 crypto_generichash_statebytes(void)
 {
-    return sizeof(crypto_generichash_state);
+    return (sizeof(crypto_generichash_state) + (size_t) 63U) & ~(size_t) 63U;
 }
 
 int

test/default/aead_aes256gcm.c

@@ -3177,7 +3177,7 @@ main(void)
     assert(crypto_aead_aes256gcm_nsecbytes() == crypto_aead_aes256gcm_NSECBYTES);
     assert(crypto_aead_aes256gcm_npubbytes() == crypto_aead_aes256gcm_NPUBBYTES);
     assert(crypto_aead_aes256gcm_abytes() == crypto_aead_aes256gcm_ABYTES);
-    assert(crypto_aead_aes256gcm_statebytes() > (size_t) 0U);
+    assert(crypto_aead_aes256gcm_statebytes() >= sizeof(crypto_aead_aes256gcm_state));
     printf("OK\n");
 
     return 0;

test/default/generichash2.c

@@ -10,7 +10,7 @@ int main(void)
         k[crypto_generichash_KEYBYTES_MAX];
     size_t h, i, j;
 
-    assert(crypto_generichash_statebytes() == sizeof st);
+    assert(crypto_generichash_statebytes() >= sizeof st);
     for (h = 0; h < crypto_generichash_KEYBYTES_MAX; ++h)
         k[h] = h;