[release-branch.go1.9] cmd/compile: permit go:cgo_import_dynamic anywhere
It's used on Solaris to import symbols from shared libraries, e.g., in
golang.org/x/sys/unix and golang.org/x/net/internal/socket.
We could use a different directive but that would require build tags
in all the places that use it.
Fixes golang/go#23939
Change-Id: I47fcf72a6d2862e304204705979c2056c2f78ec5
Reviewed-on: https://go-review.googlesource.com/94018
Run-TryBot: Andrew Bonventre <andybons@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit
41d3d153eb76f000e9f6e9edf68ed441d15081cb)
Reviewed-on: https://go-review.googlesource.com/110077
Reviewed-by: Ian Lance Taylor <iant@golang.org>