example: Add missing stdlib.h.

This fixes a build error on Windows.

diff --git a/example/allocate_module.c b/example/allocate_module.c
index c6df8c6..295e10e 100644 (file)
--- a/example/allocate_module.c
+++ b/example/allocate_module.c
@@ -20,6 +20,7 @@
 #include <malloc.h>
 #endif
 #include <sys/types.h>
+#include <stdlib.h>
 
 #if UNIT_TESTING
 extern void* _test_malloc(const size_t size, const char* file, const int line);