r179310 - Exclude test30 of Sema/return.c for Hexagon since setjmp.h include file

[Jyotsna Verma]

>> Attached patch contains the  change. Please let me know if it is good
>> to commit.
>
>It is going the right way, but do you need all that? For example, can
>__jmp_buf_tag be an empty struct?

Thanks for the suggestions!
Please refer to attached patch with the changes. 

Thanks,
Jyotsna
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