Squashed 'Sources/OpenVPN3/' content from commit 0a6e0b6e54

git-subtree-dir: Sources/OpenVPN3
git-subtree-split: 0a6e0b6e542c2d19de1f416c4caccd899d72831a

cmake/mypragmaonce.cmake

@@ -0,0 +1,8 @@
+macro(my_pragma_once)
+    set(__filename "${CMAKE_CURRENT_LIST_FILE}")
+    get_property(already_included GLOBAL PROPERTY "pr_${__filename}")
+    if(already_included)
+        return()
+    endif()
+    set_property(GLOBAL PROPERTY "pr_${__filename}" TRUE)
+endmacro()