* pinentry/pinentry.c [W32]: Do not include utsname.h
(WITH_UTF8_CONVERSION): New macro.
(lc_ctype_unknown_warning): Move that var to the top and define only
if needed.
(pinentry_utf8_to_local, pinentry_local_to_utf8): Simplyfy by using
the new macro.
(get_cmdline) [W32]: Do not build.
(get_pid_name_for_uid) [W32]: Do not build.
(pinentry_get_title) [W32]: Do not use the new utsname code.
(option_handler) <debug-wait>: Ignore for any Windows version.