install gtp-tunnel and gtp-link tools

This eases quick setup for demonstration purposes.

Change-Id: I674c463989bc1529bfe132b7ec0df7a0052169df
diff --git a/tools/Makefile.am b/tools/Makefile.am
index ec2eb66..7beae57 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -1,6 +1,6 @@
 include $(top_srcdir)/Make_global.am
 
-noinst_PROGRAMS = gtp-link		\
+bin_PROGRAMS = gtp-link		\
 		  gtp-tunnel
 
 gtp_link_SOURCES = gtp-link.c