[AD] allow stricter warnings

[Peter Wang <tjaden@xxxxxxxxxx>]

Hi,

This patch allows you to include Allegro headers into a program you wish 
to compile with gcc -Wshadow -Wstrict-prototypes -Wmissing-prototypes (I 
need this for something).  You could do it before if your Allegro 
headers were in a system header directory, but if they were not then gcc 
would spew warnings about missing prototypes and parameters shadowing 
'line' (Allegro), 'time' (libc), 'y1' (libc) and 'vsync' (Allegro).

Peter

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