[PATCH] gold: Fix a minor bug in --exclude-libs.

[Doug Kwan (關振德)]

2009/5/19 Ian Lance Taylor <iant@google.com>:

>> +alt/libexclude_libs_test_3.a: exclude_libs_test_3.o
>> +     $(TEST_AR) rc $@ $^
>
> Does this work if the directory "alt" has not already been created?

I have to checked.  If not, I'll fix it.  I just copied what other tests do.

-Doug