RFA: skip failing ld tests on arm-aout

[Nick Clifton]

Hi Zack,

> ld/testsuite:
>         * ld-scripts/data.exp, ld-scripts/provide.exp: Skip all tests
>         as UNSUPPORTED if is_aout_format.
>         * ld-scripts/size.exp:  Likewise.  Properly mark tests
>         UNSUPPORTED instead of just returning.

Approved - please apply.

Cheers
   Nick