[gold patch] Incremental 12/18: Add end-to-end test cases for incremental update

[Cary Coutant]

>>>       * testsuite/Makefile.am: Add incremental_test_2, incremental_test_3,
>>>       incremental_test_4.
>>>       * testsuite/Makefile.in: Regenerate.
>>>       * testsuite/two_file_test_1_v1.cc: New test source file.
>>>       * testsuite/two_file_test_1b_v1.cc: New test source file.
>>>       * testsuite/two_file_test_2_v1.cc: New test source file.
>>
>> This is OK.
>
> Oops, I'm going to hold this one until after patch 14. Without support
> for tracking sonames -- in some configurations -- these tests try to
> generate a much bigger .dynstr section during the incremental link and
> run out of patch space.

Now that patches 13 and 14 are in, these tests now pass, and I've
committed this patch.

-cary