adjusting xil eth to work for us

bsp_z7/lwip/xilinx_eth/CMakeLists.txt

@@ -0,0 +1,27 @@
+set (LWIP_INCLUDE_DIRS_XIL
+    "${LWIP_DIR}/src/include"
+    "${LWIP_DIR}/src/include/compat/posix"
+    "include"
+)
+
+set(lwip_SRCS_XIL
+    ${lwipcore_SRCS}
+    ${lwipcore4_SRCS}
+    ${lwipcore6_SRCS}
+    ${lwipnetif_SRCS}
+    ${lwipapi_SRCS}
+    #${LWIP_DIR}/contrib/ports/freertos/sys_arch.c
+    #${LWIP_DIR}/src/netif/slipif.c
+    #${LWIP_DIR}/src/apps/tftp/tftp.c
+)
+
+
+add_library(lwip_xil EXCLUDE_FROM_ALL ${lwip_SRCS_XIL})
+
+target_include_directories(lwip_xil PUBLIC ${LWIP_INCLUDE_DIRS_XIL})
+
+target_sources(lwip_xil PRIVATE xethernet.c)
+
+add_subdirectory(netif)
+add_subdirectory(port)
+