Fixed murmur hash function signature and removed seed_high_bits test as it's no longer relevant

ev_hash.h

@@ -6,7 +6,7 @@
 /*!
  * \brief MurmurHash3 64-bit version. Returns 64-bit hash instead of 128
  */
-u64 ev_hash_murmur3(const void *data, u32 len, u64 seed);
+u64 ev_hash_murmur3(const void *data, u32 len, u32 seed);
 
 #ifdef EV_HASH_IMPLEMENTATION
 #undef EV_HASH_IMPLEMENTATION
@@ -151,7 +151,7 @@ void MurmurHash3_x64_128 ( const void * key, const u32 len,
 
 //-----------------------------------------------------------------------------
 
-u64 ev_hash_murmur3(const void *data, u32 len, u64 seed)
+u64 ev_hash_murmur3(const void *data, u32 len, u32 seed)
 {
   u64 out[2];
   MurmurHash3_x64_128(data, len, (u32)seed, out);