Reset Clipboard to undefined if native code (#1206)

Chrome now ships with a window.Clipboard built in, which breaks this check. This ensures we're not grabbing the built-in Clipboard and definitely have the correct package version. Fixes #1181.
PrismJS · Oct 19, 2017 · b41d571 · b41d571
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diff --git a/plugins/copy-to-clipboard/prism-copy-to-clipboard.js b/plugins/copy-to-clipboard/prism-copy-to-clipboard.js
@@ -11,6 +11,10 @@
 
 	var Clipboard = window.Clipboard || undefined;
 
+	if (/(native code)/.test(Clipboard.toString())) {
+		Clipboard = undefined;
+	}
+
 	if (!Clipboard && typeof require === 'function') {
 		Clipboard = require('clipboard');
 	}

diff --git a/plugins/copy-to-clipboard/prism-copy-to-clipboard.min.js b/plugins/copy-to-clipboard/prism-copy-to-clipboard.min.js