speedo: Add simple logos to the installer.
* build-aux/speedo/w32/README.txt: Include GnuPG Readme. * build-aux/speedo/w32/gnupg-logo-150x57.bmp: New. * build-aux/speedo/w32/gnupg-logo-164x314.bmp: New. * build-aux/speedo/w32/inst.nsi: Add logos. * build-aux/speedo.mk ($(bdir)/NEWS.tmp): Extract news items.
The welcome page logo is basically a placeholder until someone has
created a pretty one.