Specify dependencies libs explicitly.

Such setup is better for cross compilation. Also changed Makefile to
properly make the project with these libraries.

deps/libmnl/README

@@ -0,0 +1,28 @@
+= What is libmnl? =
+
+libmnl is a minimalistic user-space library oriented to Netlink developers.
+There are a lot of common tasks in parsing, validating, constructing of
+both the Netlink header and TLVs that are repetitive and easy to get wrong.
+This library aims to provide simple helpers that allows you to re-use code
+and to avoid re-inventing the wheel. The main features of this library are:
+
+* Small: the shared library requires around 30KB for an x86-based computer.
+* Simple: this library avoids complexity and elaborated abstractions that
+tend to hide Netlink details.
+* Easy to use: the library simplifies the work for Netlink-wise developers.
+It provides functions to make socket handling, message building, validating,
+parsing and sequence tracking, easier.
+* Easy to re-use: you can use the library to build your own abstraction layer
+on top of this library.
+* Decoupling: the interdependency of the main bricks that compose the library
+is reduced, i.e. the library provides many helpers, but the programmer is not
+forced to use them.
+
+= Example files =
+
+You can find several example files under examples/ that you can compile by
+invoking `make check'.
+
+--
+08/sep/2010
+Pablo Neira Ayuso <pablo@netfilter.org>