* src/exdll.h: Add prototype.
* src/exdll.c: Cast around.
* src/g4wihelp.c (dummy): Use MEssageBoxA.
(config_init): Convert cmdline to ascii.
(config_fetch): Use ascii version of popstringn.
(config_fetch_bool): Ditto.
(read_w32_registry_string): Use ascii versions of the registry
functions.
(KillProc): s/strcmp/wsccmp/