speedo,w32: Adjustments for the new Unicode NSIS plugins.
* build-aux/speedo/w32/inst.nsi: Convert to UTF-8. Add Unicode statement. * build-aux/speedo.mk (installer): Remove -INPUTCHARSET.
(cherry picked from commit 7e1f36b2425e0ee041bd16b1ec51b8128329aab9)
- GnuPG-bug-id: T6448