[powerpc] fix helper routines

[Nathan Sidwell]

This patch fixes two issues I found in updating vxworks support.

1) the e500crtsav assembly files had duplicated a typo in the jumps to the 
'done' label.

2) one of those files had omitted the FUNC_END macros.

I think these went undiscovered because gcc doesn't emit calls to these 
routines.  But I hit them when building libraries.

built & tested for powerpc-vxworks.

ok?
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery

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