minor observations on Mac build of 22.0.99

[Ken Raeburn]

I grabbed the 22.0.99 pretest and built it on a couple of Macs, one  
PPC and one Intel.  Both builds went just fine, and Emacs installs  
and (so far) runs fine as well.

A couple observations, neither of which seems critical to address for  
the release:

1) The installer adds files to /Applications/Emacs.app if it already  
exists, rather than replacing that tree completely.  On one of my  
machines, /Applications/Emacs.app/Contents/MacOS/bin now contains  
both emacs-22.0.91 and emacs-22.0.99.  If I move Emacs.app to the  
trash before installing, the result is cleaner, with just  
emacs-22.0.99.  (Similarly for other files: the old DOC file, some  
elisp and image files, etc., were left over from the old version.)

Is this intentional or expected, or a bug?

2) Out of curiosity, I compared the Intel and PPC trees with diff.   
Not only were the executables different, which was expected of  
course, but also leim/quail had differences in the .el.gz and .elc  
files.  Picking a .el.gz file at random, the only difference I found  
was in the date stamp.

Are these files in fact going to be identical aside from the date  
stamp in all builds?  If so, perhaps like the .elc files in the lisp  
tree they should be pre-generated for the release and pretest  
distributions.

Ken