get_executable_name - Obtains the full path to the current executable. Allegro
game programming library.
void get_executable_name(char *buf, int size);
Fills `buf' with the full path to the current executable, writing at most `size'
bytes. This generally comes from `argv' but on Unix systems it tries to get
the information from the `/proc' filesystem first, searching the directories
specified in `$PATH' if necessary. If this fails too, it tries to find the
executable name from the output of the `ps' command, using `argv' only as a
last resort if all other options fail. Example:
allegro_message("Running `%s'\n", name);