config: Remove unused library check

configure.ac is looking for the setproctitle library,
which while it might be useful, we never call setproctitle
or any other function that the library might expose.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Tested-by: NetDEF CI System <cisystem@netdef.org>
diff --git a/configure.ac b/configure.ac
index 6206510..35e4023 100755
--- a/configure.ac
+++ b/configure.ac
@@ -785,14 +785,6 @@
 	if_nametoindex if_indextoname getifaddrs \
 	uname fcntl getgrouplist])
 
-AC_CHECK_FUNCS(setproctitle, ,
-  [AC_CHECK_LIB(util, setproctitle, 
-     [LIBS="$LIBS -lutil"
-      AC_DEFINE(HAVE_SETPROCTITLE,, Have setproctitle)
-     ]
-   )
-  ]
-)
 
 AC_CHECK_HEADER([asm-generic/unistd.h],
                 [AC_CHECK_DECL(__NR_setns,