Fix location of endian.h.  Yay for POSIX next.

--- libtirpc-1.2.5/src/xdr_float.c.old	2019-12-19 18:55:48.000000000 +0000
+++ libtirpc-1.2.5/src/xdr_float.c	2019-12-29 18:54:28.408092748 +0000
@@ -83,7 +83,7 @@
 };
 #else
 
-#include <bits/endian.h>
+#include <endian.h>
 #define IEEEFP
 
 #endif /* vax */