Log Message:
Update to 0.9.1:
- input-linux_kbd: Fix tons of warnings about type re-defintions. Patch from
  Tobias Hunger.
- fix compiler error with gcc 3.4 in the pthread based scheduler. Patch from
  Tobias Hunger.
- #define GIIK_Enter and GIIK_Delete properly in <ggi/keyboard.h>
- pthread locking: fix crash on GNU Hurd
- typo fix: configure --disable-stdin now actually disables input-stdin
- input-xwin: locking is conditional, so do with unlocking. Patch from SF
  #1164406
- input-x: enable keyboard focus by default as originally intended
- build system: fix case bug in long long test
- build system: make configure fail when passing an unsupported mutex type
  to --enable-mutexes
- documentation: added manpages for input-x and input-xwin