Move IEEE754 support code to lib/

It's not strictly core code.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/server.c b/server.c
index 9cbe555..e7a9057 100644
--- a/server.c
+++ b/server.c
@@ -20,7 +20,7 @@
 #include "fio.h"
 #include "server.h"
 #include "crc/crc16.h"
-#include "ieee754.h"
+#include "lib/ieee754.h"
 
 #include "fio_version.h"