misc patches for rlfe example code

[Mike Frysinger]

attached is a patch to address these issues with rlfe:
 - trying to build rlfe on uClibc fails because it lacks sys/stropts.h
 - pty.c uses close() but doesnt include <unistd.h>
 - rlfe.c uses OpenPTY() but doesnt include "extern.h"
 - rlfe.c uses wait() but doesnt include <sys/wait.h>
 - rlfe/configure sets up LIBS but Makefile.in ignores it (breaks on bsd due 
to -lutil not being linked in properly)
-mike

readline-5.1-rlfe-updates.patch
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