Fix broken non-win32 build with bitforce enabled.
diff --git a/bitforce.c b/bitforce.c
index 63b7c89..790e000 100644
--- a/bitforce.c
+++ b/bitforce.c
@@ -15,6 +15,8 @@
#include <dirent.h>
#ifndef WIN32
#include <termios.h>
+#include <sys/stat.h>
+#include <fcntl.h>
#else
#include <windows.h>
#include <io.h>