Remove symlinks in pico example

examples/rp2040/pico-rmii/CMakeLists.txt

@@ -15,9 +15,14 @@ add_compile_definitions(
 add_executable(firmware
         driver_rp2040_rmii.c
 	main.c
-	mongoose.c
+	../../../mongoose.c
         )
 
+target_include_directories(firmware PUBLIC
+  .
+  ../../..
+)
+
 # enable usb output, disable uart output
 pico_enable_stdio_usb(firmware 1)
 pico_enable_stdio_uart(firmware 0)

examples/rp2040/pico-rmii/mongoose.c

@@ -1 +0,0 @@
-../../../mongoose.c

examples/rp2040/pico-rmii/mongoose.h

@@ -1 +0,0 @@
-../../../mongoose.h