Add murmurhash3

And use it in bloom, add it to the crc tester as well.

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/lib/murmur3.h b/lib/murmur3.h
new file mode 100644
index 0000000..89f6500
--- /dev/null
+++ b/lib/murmur3.h
@@ -0,0 +1,8 @@
+#ifndef FIO_MURMUR3_H
+#define FIO_MURMUR3_H
+
+#include <inttypes.h>
+
+uint32_t murmurhash3(const void *key, uint32_t len, uint32_t seed);
+
+#endif