potential 64 bit build issue related to zlib

include/libtorrent/file.hpp

@@ -78,6 +78,9 @@ POSSIBILITY OF SUCH DAMAGE.
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <dirent.h> // for DIR
+
+#undef _FILE_OFFSET_BITS
+
 #endif
 
 namespace libtorrent

src/file.cpp

@@ -101,6 +101,8 @@ static int my_fallocate(int fd, int mode, loff_t offset, loff_t len)
 
 #endif
 
+#undef _FILE_OFFSET_BITS
+
 // make sure the _FILE_OFFSET_BITS define worked
 // on this platform. It's supposed to make file
 // related functions support 64-bit offsets.