dashboard: remove openbsd-mips64 from misc-compile-openbsd

openbsd-mips64 does not build anymore with the current x/sys,
an intentional decision by the openbsd mips64 maintainers.
Remove it from our build set to ignore that breakage for now.
The maintainers are welcome to add it back once openbsd-mips64
builds again.

Fixes golang/go#58110.

Change-Id: Idcd251f0087fa80b5a32a87f18a8b7e9412feda8
Reviewed-on: https://go-review.googlesource.com/c/build/+/463856
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Carlos Amedee <carlos@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
diff --git a/dashboard/builders.go b/dashboard/builders.go
index 7cae068..4bf46d5 100644
--- a/dashboard/builders.go
+++ b/dashboard/builders.go
@@ -1576,7 +1576,7 @@
 	addMiscCompile("-freebsd", "freebsd-386", "freebsd-arm", "freebsd-arm64")
 	addMiscCompile("-netbsd", "netbsd-386", "netbsd-amd64")
 	addMiscCompile("-netbsd-arm", "netbsd-arm", "netbsd-arm64")
-	addMiscCompile("-openbsd", "openbsd-386", "openbsd-mips64")
+	addMiscCompile("-openbsd", "openbsd-386") // openbsd-mips64 go.dev/issue/58110
 	addMiscCompile("-openbsd-arm", "openbsd-arm", "openbsd-arm64")
 	addMiscCompile("-plan9", "plan9-386", "plan9-amd64", "plan9-arm")
 	addMiscCompile("-solaris", "solaris-amd64", "illumos-amd64")
diff --git a/dashboard/builders_test.go b/dashboard/builders_test.go
index 5588f97..a280757 100644
--- a/dashboard/builders_test.go
+++ b/dashboard/builders_test.go
@@ -786,7 +786,9 @@
 	// All completed ports should have either a real TryBot or at least a misc-compile TryBot,
 	// so this map is meant to be used to temporarily fix tests
 	// when the work of adding a new port is actively underway.
-	knownMissing := map[string]bool{}
+	knownMissing := map[string]bool{
+		"openbsd-mips64": true, // go.dev/issue/58110
+	}
 
 	var done = make(map[string]bool)
 	check := func(goos, goarch string) {