remove process use in :npm-module builds using :runtime :browser

webpack v5 doesn't provide it by default anymore and complains.
so instead of having everyone adjust their build config we just
emit the proper thing from the start.

src/main/shadow/build/output.clj

@@ -484,7 +484,15 @@
 (defn js-module-env
   [{:keys [polyfill-js] :as state} {:keys [runtime] :or {runtime :node} :as config}]
   (str "var $CLJS = {};\n"
-       "var CLJS_GLOBAL = process.browser ? (typeof(window) != 'undefined' ? window : self) : global;\n"
+
+       (case runtime
+         :node
+         "var CLJS_GLOBAL = global;\n"
+         :browser
+         "var CLJS_GLOBAL = globalThis;\n"
+         ;; default, tries to figure it out on its own
+         "var CLJS_GLOBAL = process.browser ? (typeof(window) != 'undefined' ? window : self) : global;\n")
+
        ;; closure accesses these defines via goog.global.CLOSURE_DEFINES
        "var CLOSURE_DEFINES = CLJS_GLOBAL.CLOSURE_DEFINES = $CLJS.CLOSURE_DEFINES = " (closure-defines-json state) ";\n"
        "CLJS_GLOBAL.CLOSURE_NO_DEPS = true;\n"