Backport OpenBSD patches

Here a trivial patch whcih I've used inside OpenBSD port to build it

Signed-off-by: Kirill A. Korinsky <[email protected]>

internal/locker/runtime_unix.go

@@ -1,4 +1,4 @@
-//go:build linux
+//go:build linux || openbsd
 
 /*
    Copyright 2020 Docker Compose CLI authors

pkg/remote/cache_unix.go

@@ -1,4 +1,4 @@
-//go:build linux
+//go:build linux || openbsd
 
 /*
    Copyright 2020 Docker Compose CLI authors