Fix AddAmmo setting ammo to 99 when trying to add infinite ammo
This affected the portal mission, the crate only gave you 99 portal guns instead of infinite.
/* Alloc.h */
#ifndef __COMMON_ALLOC_H
#define __COMMON_ALLOC_H
#include <stddef.h>
void *MyAlloc(size_t size);
void MyFree(void *address);
#ifdef _WIN32
void SetLargePageSize();
void *MidAlloc(size_t size);
void MidFree(void *address);
void *BigAlloc(size_t size);
void BigFree(void *address);
#else
#define MidAlloc(size) MyAlloc(size)
#define MidFree(address) MyFree(address)
#define BigAlloc(size) MyAlloc(size)
#define BigFree(address) MyFree(address)
#endif
#endif