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js: allow for multiple environment blocks in HTML

Not that I actually need it, but it's just as easy to load multiple
environment <script>s from the DOM as it is to load one, so we may as
well do that.  Since only one element can have id="environment", we do
this by matching class="environment" as well.

--- a/emccpre.js

+++ b/emccpre.js

@@ -85,14 +85,14 @@

 var Module = {

     'preRun': function() {

-        // Merge environment variables from HTML script element.

+        // Merge environment variables from HTML script elements.

         // This means you can add something like this to the HTML:

         // <script id="environment" type="application/json">

         //   { "LOOPY_DEFAULT": "20x10t11dh" }

         // </script>

-        var envscript = document.getElementById("environment");

-        var k, v;

-        if (envscript !== null)

+        var envscript, k, v;

+        for (envscript of document.querySelectorAll(

+            "script#environment, script.environment"))

             for ([k, v] of

                  Object.entries(JSON.parse(envscript.textContent)))

                 ENV[k] = v;