w32: Change default Windows install dir and add bin to PATH.
* build-aux/speedo.mk (WITH_GUI): New macro. The Windows installer is now build by default without any GUI stuff. * build-aux/speedo/w32/inst.nsi: Change standard installation directory. (AddToPath, un.RemoveFromPath): New. (gnupginst): Add bin directory to the PATH.
- Signed-off-by: Werner Koch <wk@gnupg.org>