Merge branches 'bugfix/13439-reproducible-desktop-file-utils-mimeinfo.cache',...

Merge branches 'bugfix/13439-reproducible-desktop-file-utils-mimeinfo.cache', 'bugfix/13442-reproducible-gdk-pixbuf-loaders.cache', 'bugfix/13441-reproducible-glib2.0-giomodule.cache' and 'bugfix/13440-reproducible-gtk2.0-immodules.cache' into feature/3.2-alpha1