Add more support for FreeBSD

base/sys_byteorder.h

Index: base/sys_byteorder.h
diff --git a/base/sys_byteorder.h b/base/sys_byteorder.h
index 97e33acfdab33d5093cf5441284eb5f25a314c2b..17b662c58f0c148249252f76cce625118638be9f 100644
--- a/base/sys_byteorder.h
+++ b/base/sys_byteorder.h
@@ -25,7 +25,7 @@
 #include <stdlib.h>
 #elif defined(OS_MACOSX)
 #include <libkern/OSByteOrder.h>
-#elif defined(OS_OPENBSD)
+#elif defined(OS_BSD)
 #include <sys/endian.h>
 #else
 #include <byteswap.h>
@@ -42,6 +42,8 @@ inline uint16 ByteSwap(uint16 x) {
   return OSSwapInt16(x);
 #elif defined(OS_OPENBSD)
   return swap16(x);
+#elif defined(OS_FREEBSD)
+  return bswap16(x);
 #else
   return bswap_16(x);
 #endif
@@ -53,6 +55,8 @@ inline uint32 ByteSwap(uint32 x) {
   return OSSwapInt32(x);
 #elif defined(OS_OPENBSD)
   return swap32(x);
+#elif defined(OS_FREEBSD)
+  return bswap32(x);
 #else
   return bswap_32(x);
 #endif
@@ -64,6 +68,8 @@ inline uint64 ByteSwap(uint64 x) {
   return OSSwapInt64(x);
 #elif defined(OS_OPENBSD)
   return swap64(x);
+#elif defined(OS_FREEBSD)
+  return bswap64(x);
 #else
   return bswap_64(x);
 #endif