speedo: Add a w32-release target.
This simplifies building a release to:
git tag -s gnupg-2.n.m ./autogen.sh --force cd ~/b/gnupg ~/s/gnupg/configure --enable-maintainer-mode make distcheck tar xJf gnupg-2.n.m.tar.bz2 make -f gnupg-2.n.m/build-aux/speedo.mk w32-release gpg -sbvu KEYID gnupg-2.n.m.tar.bz2 gpg -sbvu KEYID gnupg-w32-2.n.m-20151008.tar.xz gpg -sbvu KEYID gnupg-w32-2.n.m-20151008.exe scp gnupg-2.n.m.tar.bz2 $TARGET scp gnupg-w32-2.n.m-20151008.tar.xz $TARGET scp gnupg-w32-2.n.m-20151008.exe $TARGET