Make includes relative, change namespace, support unity build

Subtrees/hyperleveldb/util/crc32c.cc

@@ -5,12 +5,12 @@
 // A portable implementation of crc32c, optimized to handle
 // four bytes at a time.
 
-#include "util/crc32c.h"
+#include "crc32c.h"
 
 #include <stdint.h>
-#include "util/coding.h"
+#include "coding.h"
 
-namespace leveldb {
+namespace hyperleveldb {
 namespace crc32c {
 
 static const uint32_t table0_[256] = {
@@ -329,4 +329,4 @@ uint32_t Extend(uint32_t crc, const char* buf, size_t size) {
 }
 
 }  // namespace crc32c
-}  // namespace leveldb
+}  // namespace hyperleveldb