Getting ctr closer to compiling on Windows

Signed-off-by: John Howard <jhoward@microsoft.com>

specs/spec_linux.go

@@ -0,0 +1,9 @@
+package specs
+
+import ocs "github.com/opencontainers/specs"
+
+type (
+	PlatformSpec ocs.LinuxSpec
+	ProcessSpec  ocs.Process
+	Spec         ocs.Spec
+)

specs/spec_windows.go

@@ -1,5 +1,13 @@
 package specs
 
+// Temporary Windows version of the spec in lieu of opencontainers/specs having
+// Windows support currently.
+
+type (
+	PlatformSpec WindowsSpec
+	ProcessSpec  Process
+)
+
 // This is a temporary module in lieu of opencontainers/specs being compatible
 // currently on Windows.
 

specs/unsupported.go

@@ -1,3 +0,0 @@
-// +build !windows
-
-package specs