Move the lib/ stuff around a bit

And actually remember to commit the lib/ files...

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/os/os.h b/os/os.h
index b1ed1bb..2dfed5e 100644
--- a/os/os.h
+++ b/os/os.h
@@ -25,7 +25,7 @@
 #endif
 
 #ifndef FIO_HAVE_STRSEP
-#include "../lib/lib.h"
+#include "../lib/strsep.h"
 #endif
 
 #ifndef FIO_HAVE_FADVISE