Add wrappers for malloc/realloc/free. See #43.

jv_alloc.h

@@ -0,0 +1,10 @@
+#ifndef JV_ALLOC_H
+#define JV_ALLOC_H
+
+#include <stddef.h>
+
+void* jv_mem_alloc(size_t);
+void jv_mem_free(void*);
+__attribute__((warn_unused_result)) void* jv_mem_realloc(void*, size_t);
+
+#endif