extract udp into its own static library

CMakeLists.txt

@@ -9,13 +9,13 @@ add_subdirectory(ipv4)
 add_subdirectory(arp)
 add_subdirectory(icmp)
 add_subdirectory(igmp)
+add_subdirectory(udp)
 
 add_library(limen STATIC
     src/dispatch.cpp
     src/flash.cpp
     src/handlers.cpp
     src/test_handlers.cpp
-    src/udp.cpp
 )
 
 target_include_directories(limen PUBLIC
@@ -34,6 +34,7 @@ target_link_libraries(limen PUBLIC
     arp
     icmp
     igmp
+    udp
     pico_stdlib
     pico_sha256
 )

udp/CMakeLists.txt

@@ -0,0 +1,12 @@
+add_library(udp STATIC udp.cpp)
+
+target_include_directories(udp PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+target_compile_options(udp PRIVATE -Wall -Wextra -Wno-unused-parameter)
+
+target_link_libraries(udp PUBLIC
+    util
+    eth
+    ipv4
+    debug_log
+)