build: fix unit tests

Platformio seems to be enforcing stricter compatibility with unit tests, lets just disable that.

Author: cujomalainey

platformio.ini

@@ -28,6 +28,7 @@ platform = native
 build_flags = -Wno-c++11-extensions -std=c++11
 test_build_project_src = true
 lib_deps = ANT
+lib_compat_mode = off
 
 [env:huzzah32]
 platform = espressif32