/usr/include/allegro/inline/system.inl is in liballegro4-dev 2:4.4.2-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 *         \ \  __ \ \ \ \  \ \ \   /'__`\ /'_ `\/\`'__\/ __`\
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 *
 *      System inline functions (generic C).
 *
 *      By Shawn Hargreaves.
 *
 *      See readme.txt for copyright information.
 */
#ifndef ALLEGRO_SYSTEM_INL
#define ALLEGRO_SYSTEM_INL
#include "allegro/debug.h"
#ifdef __cplusplus
   extern "C" {
#endif
AL_INLINE(void, set_window_title, (AL_CONST char *name),
{
   ASSERT(system_driver);
   if (system_driver->set_window_title)
      system_driver->set_window_title(name);
})
AL_INLINE(int, desktop_color_depth, (void),
{
   ASSERT(system_driver);
   if (system_driver->desktop_color_depth)
      return system_driver->desktop_color_depth();
   else
      return 0;
})
AL_INLINE(int, get_desktop_resolution, (int *width, int *height),
{
   ASSERT(system_driver);
   if (system_driver->get_desktop_resolution)
      return system_driver->get_desktop_resolution(width, height);
   else
      return -1;
})
#ifdef __cplusplus
   }
#endif
#endif          /* ifndef ALLEGRO_SYSTEM_INL */
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