Added implementation of lstat to port.c.

diff --git a/configure.in b/configure.in
index ad177b8..515c315 100644
--- a/configure.in
+++ b/configure.in
@@ -739,6 +739,7 @@
 	getservbyport \
 	getsockopt \
 	inet_network \
+	lstat \
 	memmove \
 	mmap \
 	rfork \