visibility.h: add #pragma GCC poison getenv setenv putenv

Just to make sure that it will never be used on NuttX. This is not an
architectural limitation, just a memory optimization, since we call
clearenv() on NuttX.

src/modules/logger/logger.cpp

@@ -370,6 +370,7 @@ void Logger::run_trampoline(int argc, char *argv[])
 		PX4_ERR("alloc failed");
 
 	} else {
+#ifndef __PX4_NUTTX
 		//check for replay mode
 		const char *logfile = getenv(px4::replay::ENV_FILENAME);
 
@@ -377,6 +378,8 @@ void Logger::run_trampoline(int argc, char *argv[])
 			logger_ptr->setReplayFile(logfile);
 		}
 
+#endif /* __PX4_NUTTX */
+
 		logger_ptr->run();
 	}