Fix -Wundef warnings for patterns `#if HAVE`

* See [Feature #17752]
* Using this to detect them:
  git grep -P 'if\s+HAVE' | grep -Pv 'HAVE_LONG_LONG|/ChangeLog|HAVE_TYPEOF'

1 files changed, 2 insertions, 2 deletions

diff --git a/siphash.c b/siphash.c
index ddf8ee245d..2c48fa8496 100644
--- a/siphash.c
+++ b/siphash.c
@@ -180,7 +180,7 @@ int_sip_dump(sip_state *state)
     int v;
 
     for (v = 0; v < 4; v++) {
-#if HAVE_UINT64_T
+#ifdef HAVE_UINT64_T
 	printf("v%d: %" PRIx64 "\n", v, state->v[v]);
 #else
 	printf("v%d: %" PRIx32 "%.8" PRIx32 "\n", v, state->v[v].hi, state->v[v].lo);
@@ -447,7 +447,7 @@ sip_hash13(const uint8_t key[16], const uint8_t *data, size_t len)
 	    OR_BYTE(4);
 	case 4:
 #if BYTE_ORDER == LITTLE_ENDIAN && UNALIGNED_WORD_ACCESS
-  #if HAVE_UINT64_T
+  #ifdef HAVE_UINT64_T
 	    last |= (uint64_t) ((uint32_t *) end)[0];
   #else
 	    last.lo |= ((uint32_t *) end)[0];