cmd/dist: remove openbsd/mips64 from incomplete ports

Remove openbsd/mips64 from incomplete ports lists - all of the necessary code
has landed and we want to run tests so we can see/deal with remaining failures.

Update #40995

Change-Id: I5d4f89af82ff3abe57570a9a8abf889498093d32
Reviewed-on: https://go-review.googlesource.com/c/go/+/267606
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
diff --git a/src/cmd/dist/build.go b/src/cmd/dist/build.go
index 20cb04d..c8c3212 100644
--- a/src/cmd/dist/build.go
+++ b/src/cmd/dist/build.go
@@ -1580,8 +1580,7 @@
 // List of platforms which are supported but not complete yet. These get
 // filtered out of cgoEnabled for 'dist list'. See golang.org/issue/28944
 var incomplete = map[string]bool{
-	"linux/sparc64":  true,
-	"openbsd/mips64": true,
+	"linux/sparc64": true,
 }
 
 func needCC() bool {