Fix CMakeLists so Platformio works properly again

zephyr/CMakeLists.txt

@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 3.13.1)
 include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
 project(test)
 
+if(DEFINED NATIVE_POSIX)
     include(FetchContent)
     FetchContent_Declare(
         exposure-notification
@@ -15,4 +16,8 @@ endif ()
     target_include_directories(app PUBLIC ${exposure-notification_SOURCE_DIR}/include)
 
     FILE(GLOB app_sources ../src/*.c* ${exposure-notification_SOURCE_DIR}/src/*.c*)
+else()
+    FILE(GLOB app_sources ../src/*.c*)
+endif()
+
 target_sources(app PRIVATE ${app_sources})

zephyr/build_native.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
 
 rm -rf build
-west build -b native_posix_64 . -- -DCMAKE_C_FLAGS="-DNATIVE_POSIX -I../../include/tls_config -DDISPLAY"
+west build -b native_posix_64 . -- -DCMAKE_C_FLAGS="-DNATIVE_POSIX -I../../include/tls_config -DDISPLAY" -DNATIVE_POSIX=1
 echo "Run ./build/zephyr/zephyr.elf"