dpdk: move rdma-core dependency to propagated

This allows for static building against DPDK. I would rather have all
nixpkgs users link properly against the shared libraries, but fixing
odp-dpdk looks like it will require patching their autoconf scripts.

pkgs/os-specific/linux/dpdk/default.nix

@@ -36,10 +36,15 @@ in stdenv.mkDerivation rec {
     libpcap
     numactl
     openssl.dev
-    rdma-core
     zlib
   ] ++ lib.optionals mod kernel.moduleBuildDependencies;
 
+  # Propagated to support current DPDK users in nixpkgs which statically link
+  # with the framework (e.g. odp-dpdk).
+  propagatedBuildInputs = [
+    rdma-core
+  ];
+
   postPatch = ''
     patchShebangs config/arm buildtools
   '';