build-sys: add contrib directory

Move files that are not compiled to <build-root>/contrib
directory. The files consist two unmaintained commands,
alternative ps & w, and and broken utmp examination / printing
utility. The dummy.c became unnecessary at the point when
autotools where re-introduced.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

Makefile.am

@@ -66,8 +66,10 @@ EXTRA_DIST = \
 	autogen.sh \
 	BUGS \
 	CodingStyle \
+	contrib/dummy.c \
+	contrib/minimal.c \
+	contrib/tmp-junk.c \
+	contrib/utmp.c \
 	COPYING.LIB \
-	dummy.c \
 	README.top \
-	tmp-junk.c \
 	$(sysconf_DATA)