[AD] AMD64 patch

[Peter Wang <tjaden@xxxxxxxxxx>]

Here is a first patch to get the C port of Allegro to work on X running 
on an AMD64 machine.  I guess it helps for other 64-bit architectures 
too.  It relies on the stdint.h being present, at the moment.

The main changes:

- where 'unsigned long' was used to store memory addresses, I replaced 
them with intptr_t.

- where 'long' or 'unsigned long' was used to store pixel values 
(usually RGBA), I replaced them with plain 'int' or 'unsigned int'.  
That means we would now assume 'int' is >= 32-bits wide.

- where 'sizeof(long)' or 'sizeof(unsigned long)' was meant to mean 
BYTES_PER_PIXEL(32), I have replaced them with 'sizeof(int32_t)' and 
'sizeof(uint32_t)'.  That means, 32-bit bitmaps now always use 4 bytes 
per pixel, instead of it depending on the size of a long.  This is 
saner, IMHO.  I also half-heartedly changed some sizeof(short)'s to 
sizeof(uint16_t).

Strictly speaking, probably only the third change is really necessary.


I compiled the patched tree on a plain x86 machine, and cross-compiled 
the mingw and djgpp versions (untested though).

Peter

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