new cctools for powerpc-darwin7 required for HEAD

[Geoff Keating]

To be used conveniently on Panther, the recent stfiwx change in HEAD  
requires a later version of cctools than the 528.5 version that's  
currently on gcc.gnu.org.  So, I've put cctools-576 on gcc.gnu.org.   
You can install it by clicking on the link below, or by running these  
commands:

ftp ftp://gcc.gnu.org/pub/gcc/infrastructure/cctools-576.dmg
hdiutil attach cctools-576.dmg
sudo installer -verbose -pkg /Volumes/cctools-576/cctools-576.pkg  
-target /

This version also handles 8-bit characters in identifiers properly, so  
all those ucnid* testcases should pass.

It's not necessary to upgrade cctools to use 4.0, since the features  
that need the cctools fixes aren't there.

Source for the new cctools is at  
<ftp://gcc.gnu.org/pub/gcc/infrastructure/cctools-576.tar.bz2>.  You  
can also get it from  
<http://www.opensource.apple.com/darwinsource/tarballs/apsl/cctools 
-576.tar.gz> (they're the same tarfile, just different compression).

The checksums are:

0ebb1a56b1af0e21d9de30b644c1c059  cctools-576.dmg
3b9a5dd3db6b4a7e9c8de02198faea25  cctools-576.tar.bz2
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