flua: follow-up to r359453, don't bother with libedit in bootstrap

The bootstrap flua should not be used for REPL-like activities; exclude it
to save the dependency on libedit and not waste time with it.

X-MFC-With:	r359453

libexec/flua/Makefile

@@ -24,9 +24,12 @@ SRCS+=	lfs.c lposix.c
 CFLAGS+=	-I${SRCTOP}/lib/liblua -I${.CURDIR}/modules -I${LUASRC}
 CFLAGS+=	-DLUA_PROGNAME="\"${PROG}\""
 
-# readline bits
+# readline bits; these aren't needed if we're building a bootstrap flua, as we
+# don't expect that one to see any REPL usage.
+.if !defined(BOOTSTRAPPING)
 CFLAGS+=	-DLUA_USE_READLINE
 CFLAGS+=	-I${SRCTOP}/lib/libedit -I${SRCTOP}/contrib/libedit
 LIBADD+=	edit
+.endif
 
 .include <bsd.prog.mk>