Fix potential make error related to fomantic files (#12079)

This prevents a potential make errors like "No rule to make sticky.js"
that happens when a file is present from a previous build but is not
generated in the current build. We don't use these module files from
fomantic so it's safe to not depend on them.

Related to: 7761245

Makefile

@@ -88,7 +88,11 @@ LDFLAGS := $(LDFLAGS) -X "main.MakeVersion=$(MAKE_VERSION)" -X "main.Version=$(G
 
 GO_PACKAGES ?= $(filter-out code.gitea.io/gitea/integrations/migration-test,$(filter-out code.gitea.io/gitea/integrations,$(shell $(GO) list -mod=vendor ./... | grep -v /vendor/)))
 
-WEBPACK_SOURCES := $(shell find web_src -type f)
+FOMANTIC_CONFIGS := semantic.json web_src/fomantic/theme.config.less web_src/fomantic/_site/globals/site.variables
+FOMANTIC_DEST := web_src/fomantic/build/semantic.js web_src/fomantic/build/semantic.css
+FOMANTIC_DEST_DIR := web_src/fomantic/build
+
+WEBPACK_SOURCES := $(shell find web_src/js web_src/less -type f) $(FOMANTIC_DEST)
 WEBPACK_CONFIGS := webpack.config.js
 WEBPACK_DEST := public/js/index.js public/css/index.css
 WEBPACK_DEST_ENTRIES := public/js public/css public/fonts public/serviceworker.js public/img/svg
@@ -110,10 +114,6 @@ endif
 
 GO_SOURCES_OWN := $(filter-out vendor/% %/bindata.go, $(GO_SOURCES))
 
-FOMANTIC_CONFIGS := semantic.json web_src/fomantic/theme.config.less web_src/fomantic/_site/globals/site.variables
-FOMANTIC_DEST := web_src/fomantic/build/semantic.js web_src/fomantic/build/semantic.css
-FOMANTIC_DEST_DIR := web_src/fomantic/build
-
 #To update swagger use: GO111MODULE=on go get -u github.com/go-swagger/go-swagger/cmd/swagger@v0.20.1
 SWAGGER := $(GO) run -mod=vendor github.com/go-swagger/go-swagger/cmd/swagger
 SWAGGER_SPEC := templates/swagger/v1_json.tmpl