[AD] Allegro 64bit on OS X

[Evert Glebbeek <eglebbk@xxxxxxxxxx>]

I found the attached uncommited changes in my local sandbox. Without  
then compiling Allegro in 64 bit mode on OS X does not work:
/Users/eglebbk/Program/Allegro5/4.9/src/macosx/main.m: In function ‘- 
[AllegroAppDelegate updateSystemActivity:]’:
/Users/eglebbk/Program/Allegro5/4.9/src/macosx/main.m:129: warning:  
implicit declaration of function ‘UpdateSystemActivity’
/Users/eglebbk/Program/Allegro5/4.9/src/macosx/main.m:129: error:  
‘UsrActivity’ undeclared (first use in this function)
/Users/eglebbk/Program/Allegro5/4.9/src/macosx/main.m:129: error:  
(Each undeclared identifier is reported only once
/Users/eglebbk/Program/Allegro5/4.9/src/macosx/main.m:129: error: for  
each function it appears in.)

whereas 32 bit mode works fine without the same. Apple's documentation  
indicates that "deprecated features" are not available in 64 bit, but  
UpdateSystemActivity is not deprecated and the documentation likewise  
suggests that all that should be required is to #include  
CoreServices.h or Power.h. However, these do not work for me.

With the attached change, compiling and running Allegro in 64 bit mode  
works fine (except that I don't have 64 bit versions of Ogg/Vorbis and  
FLAC installed, which makes those only available in 32 bit). Setting  
CMAKE_OSX_ARCHITECTURES to "i386; x86_64" will produce "fat binaries"  
and "fat libraries", as it should.

Part of me is tempted to commit the change, but it looks a bit hackish  
(it would certainly get a big fat FIXME attached to it) and it  
shouldn't be necessary. Unless someone else knows how to do this  
properly (I tried googling for it several weeks back without much  
success) I'm not sure what else to do in the mean time though...

Evert

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