Obtains the full path to the current executable.
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);
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