stdlib.h explicitly called in fixtures when malloc used, now. (Fixes issue
* For example, when using FreeRTOS UNITY_FIXTURE_MALLOC becomes pvPortMalloc()
* and UNITY_FIXTURE_FREE becomes vPortFree(). */
#if !defined(UNITY_FIXTURE_MALLOC) || !defined(UNITY_FIXTURE_FREE)
+ #include <stdlib.h>
#define UNITY_FIXTURE_MALLOC(size) malloc(size)
#define UNITY_FIXTURE_FREE(ptr) free(ptr)
#else
