Fix murmurhash implementation (used for crafting) (#107)

Unaligned access does not work on ARM platforms, since data was declared u64*
the compiler assumed it was aligned, thus making the existing workaround useless.

Since this hash function is used for crafting, this commit fixes #106

src/util/numeric.cpp

@@ -60,19 +60,22 @@ u64 murmur_hash_64_ua(const void *key, int len, unsigned int seed)
 	const int r = 47;
 	u64 h = seed ^ (len * m);
 
+#if defined(__IOS__) // make sure memcpy() will not assume align
+	const u8 *data = (const u8 *)key;
+	const u8 *end = data + ( (unsigned int)len & ~7 );
+#else
 	const u64 *data = (const u64 *)key;
 	const u64 *end = data + (len / 8);
+#endif
 
 	while (data != end) {
 		u64 k;
-#ifndef __IOS__
 		memcpy(&k, data, sizeof(u64));
+#ifdef __IOS__
+		data += sizeof(u64);
 #else
-		k = 0; // strange workaround for iOS
-		for (u8 i = 0; i < sizeof(u64); i++)
-			((char*) &k)[i] = data[i];
-#endif
 		data++;
+#endif
 
 		k *= m;
 		k ^= k >> r;