cmd/link,runtime/cgo: enable PT_TLS generation on OpenBSD
OpenBSD 6.0 and later have support for PT_TLS in ld.so(1). Now that OpenBSD 6.1 has been released, OpenBSD 5.9 is no longer officially supported and Go can start generating PT_TLS for OpenBSD cgo binaries. This also allows us to remove the workarounds in the OpenBSD cgo runtime. This change also removes the environ and progname exports - these are now provided directly by ld.so(1) itself. Fixes #19932 Change-Id: I42e75ef9feb5dcd4696add5233497e3cbc48ad52 Reviewed-on: https://go-review.googlesource.com/40331Reviewed-by:Ian Lance Taylor <iant@golang.org>
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