a couple of small patches

[Phil Blundell]

With the current cvs head, ld configured for --target=arm-linuxgnueabi
will crash if invoked with something like "ld -b binary /dev/null".
(Useless though this seems, it appears to be a fairly common idiom for
programs to use when they're trying to check for supported linker
options from an autoconf script.)

Here are two patches, one for ld and one for bfd, which clear up the
segfault for me.

p.

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