Update src/mem.h

src/mem.h

@@ -14,6 +14,7 @@
 void* _malloc( size_t query );
 void  _free( void* mem );
 void* heap_init( size_t initial_size );
+void *map_pages(void const *addr, size_t length, int additional_flags);
 
 #define DEBUG_FIRST_BYTES 4