Bug 1882228: Prevent possible errors due to directories not being empty when incrementally building macOS frameworks. r=glandium

Differential Revision: https://phabricator.services.mozilla.com/D202808

browser/app/Makefile.in

@@ -84,7 +84,7 @@ MAC_BUNDLE_VERSION = $(shell $(PYTHON3) $(srcdir)/macversion.py --version=$(MOZ_
 
 .PHONY: repackage
 tools repackage:: $(DIST)/bin/$(MOZ_APP_NAME) $(objdir)/macbuild/Contents/MacOS-files.txt
-	rm -rf $(dist_dest)
+	rm -rf '$(dist_dest)'
 	$(MKDIR) -p '$(dist_dest)/Contents/MacOS'
 	$(MKDIR) -p '$(dist_dest)/$(LPROJ)'
 	rsync -a --exclude '*.in' $(srcdir)/macbuild/Contents '$(dist_dest)' --exclude English.lproj