[release-branch.go1.11] cmd/cgo: ignore unrecognized GCC warning group pragmas
CL 159859 causes build failure with old clang versions (3.4.1) on FreeBSD 10.3/10.4.
Update #29962
Reviewed-on: https://go-review.googlesource.com/c/160777
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
(cherry picked from commit
6f4dc1ccf9735013fdb7cd044bda29d19bebb906)
Change-Id: Ie78d552ea6494fe3c4059847b26c2a6e206f9515
Reviewed-on: https://go-review.googlesource.com/c/160780
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>