runtime: skip TestCgoExternalThreadSIGPROF on OS X 10.6
The test program requires static constructor, which in turn needs
external linking to work, but external linking never works on 10.6.
This should fix the darwin-{386,amd64} builders.
Change-Id: I714fdd3e35f9a7e5f5659cf26367feec9412444f
Reviewed-on: https://go-review.googlesource.com/2235
Reviewed-by:
Brad Fitzpatrick <bradfitz@golang.org>
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