Fix webpack build warnings (#13752)

Turns out some of the dependencies make use of optional dependencies
like the vue-template-compiler. Install them again and install
fomantic-ui only when it's being build to fix webpack warnings.

Makefile

@@ -623,7 +623,7 @@ docs:
 	cd docs; make trans-copy clean build-offline;
 
 node_modules: package-lock.json
-	npm install --no-save --no-optional
+	npm install --no-save
 	@touch node_modules
 
 .PHONY: npm-update
@@ -638,7 +638,7 @@ fomantic: $(FOMANTIC_DEST)
 
 $(FOMANTIC_DEST): $(FOMANTIC_CONFIGS) | node_modules
 	@if [ ! -d node_modules/fomantic-ui ]; then \
-		npm install --no-save; \
+		npm install --no-save --no-package-lock fomantic-ui@2.8.7; \
 	fi
 	rm -rf $(FOMANTIC_DEST_DIR)
 	cp -f web_src/fomantic/theme.config.less node_modules/fomantic-ui/src/theme.config

package.json

@@ -52,9 +52,6 @@
     "worker-loader": "3.0.5",
     "wrap-ansi": "7.0.0"
   },
-  "optionalDependencies": {
-    "fomantic-ui": "2.8.7"
-  },
   "devDependencies": {
     "eslint": "7.14.0",
     "eslint-plugin-html": "6.1.1",