Native testing with FreeRTOS

[lptr]

This should work on Linux, on Windows under WSL, and on macOS, as we are using the Posix port of FreeRTOS. It works mostly, but when we try to delete a task upon completion, we fail, with the following stacktrace:

__pthread_kill_implementation@0x00007ffff7af19fc (Unknown Source:44)
__pthread_kill_internal@0x00007ffff7af19fc (Unknown Source:78)
__GI___pthread_kill@0x00007ffff7af19fc (Unknown Source:89)
__GI_raise@0x00007ffff7a9d476 (Unknown Source:26)
__GI_abort@0x00007ffff7a837f3 (Unknown Source:79)
??@0x00007ffff7e2db9e (Unknown Source:0)
??@0x00007ffff7e3920c (Unknown Source:0)
std::terminate()@0x00007ffff7e39277 (Unknown Source:0)
__gxx_personality_v0@0x00007ffff7e38afc (Unknown Source:0)
??@0x00007ffff7c9aa06 (Unknown Source:0)
_Unwind_ForcedUnwind@0x00007ffff7c9b100 (Unknown Source:0)
__GI___pthread_unwind@0x00007ffff7af8446 (Unknown Source:130)
__do_cancel@0x00007ffff7af0cba (Unknown Source:280)
__GI___pthread_exit@0x00007ffff7af0cba (Unknown Source:36)
prvSwitchThread@0x00005555555aab1f (\home\lptr\Workspace\kivancsi\ugly-duckling\test-lib\freertos\src\port.c:532)
prvPortYieldFromISR@0x00005555555aab9b (\home\lptr\Workspace\kivancsi\ugly-duckling\test-lib\freertos\src\port.c:330)
vPortYield@0x00005555555ab0c3 (\home\lptr\Workspace\kivancsi\ugly-duckling\test-lib\freertos\src\port.c:338)
vTaskDelete@0x00005555555ad722 (\home\lptr\Workspace\kivancsi\ugly-duckling\test-lib\freertos\src\tasks.c:2324)
farmhub::kernel::Task::~Task@0x00005555555b086b (\home\lptr\Workspace\kivancsi\ugly-duckling\src\kernel\Task.hpp:173)
farmhub::kernel::Task::executeTask@0x00005555555b086b (\home\lptr\Workspace\kivancsi\ugly-duckling\src\kernel\Task.hpp:183)
prvWaitForStart@0x00005555555aaf5e (\home\lptr\Workspace\kivancsi\ugly-duckling\test-lib\freertos\src\port.c:499)

There's also the question of compiling FreeRTOS not from copied-over sources.