do not install test & development tool

These tools shouldn't be delivered to end-users, included in distro
packages. Also the execuable names "memtest" and "tcp_proxy" are too
general to install into sbin dir.

tools/devel/tcp_proxy/Makefile.am

@@ -6,7 +6,7 @@ if XRDP_DEBUG
 AM_CPPFLAGS += -DXRDP_DEBUG
 endif
 
-sbin_PROGRAMS = \
+noinst_PROGRAMS = \
   tcp_proxy
 
 tcp_proxy_SOURCES = \
@@ -14,4 +14,4 @@ tcp_proxy_SOURCES = \
 
 tcp_proxy_LDADD = \
   $(top_builddir)/common/libcommon.la \
-  -ldl
+  -ldl