This commit fixes tests which fail on some versions of AIX 7.2 due
to internal bugs.

getsockname isn't working properly with unix networks.

Timezone files aren't returning a correct output.

Change-Id: I4ff15683912be62ab86dfbeeb63b73513404d086
Reviewed-on: https://go-review.googlesource.com/c/146940
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>