Fixed compile error on FreeBSD 9.

See http://code.google.com/p/leveldb/issues/detail?id=98

src/leveldb/port/port_posix.h

@@ -21,13 +21,20 @@
   #else
     #define PLATFORM_IS_LITTLE_ENDIAN false
   #endif
-#elif defined(OS_FREEBSD) || defined(OS_OPENBSD) || defined(OS_NETBSD) ||\
+#elif defined(OS_FREEBSD)
+  #include <sys/types.h>
+  #include <sys/endian.h>
+  #define PLATFORM_IS_LITTLE_ENDIAN (_BYTE_ORDER == _LITTLE_ENDIAN)
+#elif defined(OS_OPENBSD) || defined(OS_NETBSD) ||\
       defined(OS_DRAGONFLYBSD) || defined(OS_ANDROID)
   #include <sys/types.h>
   #include <sys/endian.h>
+#elif defined(OS_HPUX)
+  #define PLATFORM_IS_LITTLE_ENDIAN false
 #else
   #include <endian.h>
 #endif
+
 #include <pthread.h>
 #ifdef SNAPPY
 #include <snappy.h>
@@ -42,7 +49,7 @@
 
 #if defined(OS_MACOSX) || defined(OS_SOLARIS) || defined(OS_FREEBSD) ||\
     defined(OS_NETBSD) || defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD) ||\
-    defined(OS_ANDROID)
+    defined(OS_ANDROID) || defined(OS_HPUX)
 // Use fread/fwrite/fflush on platforms without _unlocked variants
 #define fread_unlocked fread
 #define fwrite_unlocked fwrite