build: remove Linux non-netlink config

This path is deprecated, completely untested, likely broken and will not
be maintained.  Kill it with fire.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
Acked-by: Greg Troxel <gdt@ir.bbn.com>
Acked-by: Feng Lu <lu.feng@6wind.com>
Acked-by: Paul Jakma <paul@jakma.org>
diff --git a/zebra/Makefile.am b/zebra/Makefile.am
index 0591a55..4a76317 100644
--- a/zebra/Makefile.am
+++ b/zebra/Makefile.am
@@ -9,14 +9,13 @@
 
 ipforward = @IPFORWARD@
 if_method = @IF_METHOD@
-if_proc = @IF_PROC@
 rt_method = @RT_METHOD@
 rtread_method = @RTREAD_METHOD@
 kernel_method = @KERNEL_METHOD@
 other_method = @OTHER_METHOD@
 ioctl_method = @IOCTL_METHOD@
 
-otherobj = $(ioctl_method) $(ipforward) $(if_method) $(if_proc) \
+otherobj = $(ioctl_method) $(ipforward) $(if_method) \
 	$(rt_method) $(rtread_method) $(kernel_method) $(other_method)
 
 if HAVE_NETLINK
@@ -51,10 +50,10 @@
 
 zebra_DEPENDENCIES = $(otherobj)
 
-EXTRA_DIST = if_ioctl.c if_ioctl_solaris.c if_netlink.c if_proc.c \
+EXTRA_DIST = if_ioctl.c if_ioctl_solaris.c if_netlink.c \
         if_sysctl.c ipforward_aix.c ipforward_ews.c ipforward_proc.c \
 	ipforward_solaris.c ipforward_sysctl.c rt_ioctl.c rt_netlink.c \
-	rt_socket.c rtread_netlink.c rtread_proc.c rtread_sysctl.c \
+	rt_socket.c rtread_netlink.c rtread_sysctl.c \
 	rtread_getmsg.c kernel_socket.c kernel_netlink.c mtu_kvm.c \
 	ioctl.c ioctl_solaris.c \
 	GNOME-SMI GNOME-PRODUCT-ZEBRA-MIB