[arm] branches to weak symbols

[Nathan Sidwell]

This patch fixes some arm cases where the assembler did not consider that a 
weakly defined symbol might be overridden in the final link.  It would use a 
short thumb branch resulting in an unoverridable relocation (and inability to 
build the linux kernel)

The same error is made in write.c's fixup_segment (and affects this arm problem) 
  It may affect other targets.

Fixed thusly, tested on arm-eabi. ok?

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

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