Improved iproute2 to install libnetlink.a and related header files

network/iproute2/iproute2.conf

@@ -20,6 +20,8 @@ set_confopt
 var_append makeopt " " "KERNEL_INCLUDE=$root/usr/include"
 var_append makeopt " " "LIBC_INCLUDE=$root/usr/include"
 var_append makeinstopt " " "SBINDIR=$sbindir"
+# install libnetlink.a and related header files
+var_append makeinstopt " " "DEVEL=1"
 
 # iproute2 release tarball for 2.6.22-070710 doesn't have a toplevel directory
 # Note: iproute2-2.6.23 doesn't require this hack!