fix unit tests: do not stub pthread_cond_wait

and fix the tests instead.
Some unit tests depend on pthread_cond_wait to work as expected.

platforms/posix/src/px4/common/test_stubs/CMakeLists.txt

@@ -33,7 +33,6 @@
 
 set(SRCS
     stub_daemon.cpp
-    stub_parameter.cpp
    )
 
 px4_add_library(test_stubs ${SRCS})

platforms/posix/src/px4/common/test_stubs/stub_parameter.cpp

@@ -1,11 +0,0 @@
-#include "stub_parameter.h"
-
-
-
-extern "C" {
-	/* This function blocks forever in tests, so override it with a version that can be customized */
-	int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
-	{
-		return stub_pthread_cond_wait_callback(cond, mutex);
-	}
-}

platforms/posix/src/px4/common/test_stubs/stub_parameter.h

@@ -1,8 +0,0 @@
-#pragma once
-
-#include <pthread.h>
-
-#include <functional>
-
-std::function<int(pthread_cond_t *, pthread_mutex_t *)> stub_pthread_cond_wait_callback =
-[](pthread_cond_t *, pthread_mutex_t *) {return 0;};