explorer: Fix compilation on systems that don't support nameless unions.
[wine] / programs / explorer /
drwxr-xr-x   ..
-rw-r--r-- 300 Makefile.in
-rw-r--r-- 9093 appbar.c
-rw-r--r-- 12472 desktop.c
-rw-r--r-- 25649 explorer.c
-rw-r--r-- 974 explorer.rc
-rw-r--r-- 1059 explorer_private.h
-rw-r--r-- 946 resource.h
-rw-r--r-- 20885 systray.c