runtime: ignore closeonexec ret val on openbsd/arm
runtime: ignore closeonexec ret val on openbsd/arm

Fixes #16641
Updates #11041

Change-Id: I087208a486f535d74135591b2c9a73168cf80e1a
Reviewed-on: https://go-review.googlesource.com/27490
Run-TryBot: Josh Bleecher Snyder <cdc248cc4d32e4fbfe04e45228163bcecd48a0b9@gmail.com>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

momchil-velikov/go,akutz/go,Cofyc/go,vsekhar/elastic-go,nawawi/go,momchil-velikov/go,vsekhar/elastic-go,vsekhar/elastic-go,polyverse-security/go,ImJasonH/go,CAFxX/go,vsekhar/elastic-go,cloudflare/go,suncycheng/go,Cofyc/go,christopher-henderson/Go,cloudflare/go,golang/go,josharian/go,codestation/go,momchil-velikov/go,vsekhar/elastic-go,goodlang/good,CAFxX/go,polyverse-security/go,akutz/go,codestation/go,polyverse-security/go,Cofyc/go,golang/go,suncycheng/go,goodlang/good,momchil-velikov/go,linux-on-ibm-z/go,derekmarcotte/go,ImJasonH/go,derekmarcotte/go,codestation/go,polyverse-security/go,linux-on-ibm-z/go,polyverse-security/go,vsekhar/elastic-go,golang/go,nawawi/go,ImJasonH/go,golang/go,goodlang/good,momchil-velikov/go,polyverse-security/go,codestation/go,Cofyc/go,josharian/go,linux-on-ibm-z/go,suncycheng/go,nawawi/go,CAFxX/go,josharian/go,nawawi/go,akutz/go,ImJasonH/go,cloudflare/go,goodlang/good,cloudflare/go,codestation/go,nawawi/go,cloudflare/go,derekmarcotte/go,vsekhar/elastic-go,cloudflare/go,momchil-velikov/go,cloudflare/go,ImJasonH/go,linux-on-ibm-z/go,nawawi/go,polyverse-security/go,ImJasonH/go,goodlang/good,josharian/go,derekmarcotte/go,vsekhar/elastic-go,josharian/go,goodlang/good,cloudflare/go,CAFxX/go,linux-on-ibm-z/go,ImJasonH/go,josharian/go,CAFxX/go,Cofyc/go,CAFxX/go,akutz/go,golang/go,akutz/go,josharian/go,josharian/go,akutz/go,codestation/go,linux-on-ibm-z/go,linux-on-ibm-z/go,Cofyc/go,polyverse-security/go,golang/go,derekmarcotte/go,derekmarcotte/go,Cofyc/go,codestation/go,golang/go,CAFxX/go,ImJasonH/go,nawawi/go,suncycheng/go,momchil-velikov/go,suncycheng/go,linux-on-ibm-z/go,nawawi/go,derekmarcotte/go,goodlang/good,goodlang/good,golang/go,akutz/go,CAFxX/go,suncycheng/go,momchil-velikov/go,akutz/go,codestation/go,suncycheng/go,derekmarcotte/go,Cofyc/go,suncycheng/go