Specify dependencies libs explicitly.

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

deps/libmnl/.gitignore

@@ -0,0 +1,20 @@
+*~
+*.la
+*.lo
+*.o
+.deps/
+.libs/
+Makefile
+Makefile.in
+
+/aclocal.m4
+/autom4te.cache/
+/build-aux/
+/config.*
+/configure
+/libtool
+/stamp-h1
+
+/libmnl.pc
+
+/libmnl-*.tar.bz2