md_apply_fix3 bug on arm-linux

[Philip Blundell]

A user reports that "mov r0, #UNDEFINED_SYMBOL" assembles to "mov r0,
#0" without emitting any relocation or diagnostic, which clearly isn't
right.

Also, this code:

.word 0
foo:
mov r0, #foo

assembles to "mov r0, #4", again with no relocation, which also seems
fairly bogus.

A patch like the one below seems to clear it up.  Does this look right? 
I guess I should also generate some cases for the testsuite.

Thanks

p.

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