al_install_system
bool al_install_system(int version, int (*atexit_ptr)(void (*)(void)))
Initialize the Allegro system. No other Allegro functions can be called before this (with one or two exceptions).
The version field should always be set to ALLEGRO_VERSION_INT.
If atexit_ptr is non-NULL, and if hasn't been done already, al_uninstall_system will be registered as an atexit function.
Returns true if Allegro was successfully initialized by this function call (or already was initialized previously), false if Allegro cannot be used.
See also: al_init
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