lang/go: reinstate nobtcfi patch

This was dropped in the update with the consequence that binaries using
external linking weren't correctly marked, causing breakage of some go
ports on BTI enabled machines.

Reported by Isaac Merleo, tested by sthen and rsadowski
ok jsing sthen

lang/go/Makefile

@@ -11,6 +11,7 @@ VERSION =		1.22.0
 DISTNAME =		go${VERSION}.src
 PKGNAME =		go-${VERSION}
 PKGSPEC =		${FULLPKGNAME:S/go-/go-=/}
+REVISION =		0
 
 CATEGORIES =		lang
 

lang/go/patches/patch-src_cmd_link_internal_ld_lib_go

@@ -0,0 +1,11 @@
+Index: src/cmd/link/internal/ld/lib.go
+--- src/cmd/link/internal/ld/lib.go.orig
++++ src/cmd/link/internal/ld/lib.go
+@@ -1441,6 +1441,7 @@ func (ctxt *Link) hostlink() {
+ 		}
+ 	case objabi.Hopenbsd:
+ 		argv = append(argv, "-Wl,-nopie")
++		argv = append(argv, "-Wl,-z,nobtcfi")
+ 		argv = append(argv, "-pthread")
+ 		if ctxt.Arch.InFamily(sys.ARM64) {
+ 			// Disable execute-only on openbsd/arm64 - the Go arm64 assembler