Add Process.exit stub on windows (#5524)

RX14 · web-flow · commit c663f524ffa4 · 2018-01-04T12:10:14.000Z
This stub allows the ::exit function to compile on win32.
diff --git a/src/windows_stubs.cr b/src/windows_stubs.cr
@@ -53,3 +53,9 @@ abstract class IO
     end
   end
 end
+
+class Process
+  def self.exit(status = 0)
+    LibC.exit(status)
+  end
+end
