glib/gtimezone.c: Use RegLoadMUIStringW() to query Std/Dlt strings
glib/gtimezone.c: Use RegLoadMUIStringW() to query Std/Dlt strings

The existing method of using RegQueryValueExW() to query the Std/Dlt
strings can only retrive the localized versions of those strings, so
that means they will vary by the language version of Windows.  Instead,
use RegQueryValueExW() only as a fallback when RegLoadMUIStringW() fails,
as RegLoadMUIStringW() can query for the Std and Dlt strings in
whatever language we need by setting the locale stuff programatically on
the fly.

endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib