Re-enabled bounds check for primitive buffer. Fixes crashing on larger maps.

memory.c

@@ -29,10 +29,8 @@ void mem_prim_reset(int db)
 
 void *mem_prim(size_t size)
 {
-#if _DEBUG
     if (nextpri + size > primbuff_bounds)
         return NULL;    // TODO: report error
-#endif
 
     void *prim = nextpri;
     nextpri += size;