fix arm big endian links

[Nathan Sidwell <nathan at codesourcery dot com>]

I've committed this patch to fix a crash when building a big endian glibc.

The stub_group array links each input section to a stub section.  Multiple input 
sections can be linked to the same output section, so there are duplicate 
stub_sec values in this array, and we'd process each stub every time we met it. 
 However, one of those input sections 'owns' the stub section -- the one in the 
corresponding link_sec field.  So this patch adds an additional check to only 
process the stub when we're looking at the owning slot.

I also fixed the formatting issues with the for loop.

built and tested with arm-none-linux-gnueabi.

nathan
--
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery

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