Add Manifest to core dirs.

hdl/gn4124core/rtl/Manifest.py

+files = ["dma_controller.vhd",
+         "dma_controller_wb_slave.vhd",
+         "gn4124_core_pkg.vhd",
+         "l2p_arbiter.vhd",
+         "l2p_dma_master.vhd",
+         "p2l_decode32.vhd",
+         "p2l_dma_master.vhd",
+         "wbmaster32.vhd"]
+
+modules = { "local" : "spartan6",
+            "git" : "git://ohwr.org/hdl-core-lib/general-cores.git" }
+

hdl/gn4124core/rtl/spartan3/Manifest.py

+files = ["gn4124_core.vhd",
+         "gn4124_core_private_pkg.vhd",
+         "l2p_ser.vhd",
+         "p2l_des.vhd"]

hdl/gn4124core/rtl/spartan6/Manifest.py

+files = ["gn4124_core.vhd",
+         "gn4124_core_private_pkg.vhd",
+         "l2p_ser.vhd",
+         "p2l_des.vhd",
+         "serdes_1_to_n_clk_pll_s2_diff.vhd",
+         "serdes_1_to_n_data_s2_se.vhd",
+         "serdes_n_to_1_s2_diff.vhd",
+         "serdes_n_to_1_s2_se.vhd"]