runtime: merge setting new signal mask in minit
All the variants that sets the new signal mask in minit do the same thing, so merge them. This requires an OS-specific sigdelset function; the function already exists for linux, and is now added for other OS's. Change-Id: Ie96f6f02e2cf09c43005085985a078bd9581f670 Reviewed-on: https://go-review.googlesource.com/29771 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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