don't ship icon-theme.cache with Julia #32980 (#33983)

This was introduced in: e2821f5

Package managers track which package owns a file, and if the
icon-theme.cache is owned by Julia, the package manager will get
confused when that file already exists on the system or when another
process overwrites it.

It's the DE's job to update that cache.

Author: cmcaine

Makefile

@@ -377,7 +377,6 @@ endif
 	mkdir -p $(DESTDIR)$(datarootdir)/icons/hicolor/scalable/apps/
 	$(INSTALL_F) $(JULIAHOME)/contrib/julia.svg $(DESTDIR)$(datarootdir)/icons/hicolor/scalable/apps/
 	-touch -c $(DESTDIR)$(datarootdir)/icons/hicolor/
-	-gtk-update-icon-cache --ignore-theme-index $(DESTDIR)$(datarootdir)/icons/hicolor/
 	mkdir -p $(DESTDIR)$(datarootdir)/applications/
 	$(INSTALL_F) $(JULIAHOME)/contrib/julia.desktop $(DESTDIR)$(datarootdir)/applications/
 	# Install appdata file