[AArch64] Call abort() consistently for un-handled stub.

[Marcus Shawcroft]

Hi,

Ensure we hard stop via abort() for unhandled stub types rather than 
continuing either silently (or noisly with a BFD_FAIL()).

Committed.

Cheers
/Marcus

2015-03-04  Marcus Shawcroft  <marcus.shawcroft@arm.com>

        * elfnn-aarch64.c (aarch64_build_one_stub): Call abort. 
 

        (aarch64_size_one_stub): Likewise.
        (aarch64_map_one_stub): Likewise.
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