[libxml2] Disable hash randomization when fuzzing

[Nick Wellnhofer <nwellnhof src gnome org>]

commit fa3166c227f0095204521672b8ce4770dafd0035
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Fri Apr 12 12:03:04 2019 +0200

    Disable hash randomization when fuzzing
    
    Use the FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION macro proposed by
    libFuzzer.

 dict.c | 3 ++-
 hash.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/dict.c b/dict.c
index 0ef3718d..14fe398e 100644
--- a/dict.c
+++ b/dict.c
@@ -38,7 +38,8 @@
  *  list we will use the BigKey algo as soon as the hash size grows
  *  over MIN_DICT_SIZE so this actually works
  */
-#if defined(HAVE_RAND) && defined(HAVE_SRAND) && defined(HAVE_TIME)
+#if defined(HAVE_RAND) && defined(HAVE_SRAND) && defined(HAVE_TIME) && \
+    !defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION)
 #define DICT_RANDOMIZATION
 #endif
 
diff --git a/hash.c b/hash.c
index b0b4abc9..1145cb93 100644
--- a/hash.c
+++ b/hash.c
@@ -33,7 +33,8 @@
  * it seems that having hash randomization might be a good idea
  * when using XML with untrusted data
  */
-#if defined(HAVE_RAND) && defined(HAVE_SRAND) && defined(HAVE_TIME)
+#if defined(HAVE_RAND) && defined(HAVE_SRAND) && defined(HAVE_TIME) && \
+    !defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION)
 #define HASH_RANDOMIZATION
 #endif