Workaround for missing RegDeleteKeyEx() method.

src/dosinst.h

@@ -89,6 +89,7 @@ char *searchpath(char *name);
  */
 # ifndef KEY_WOW64_64KEY
 #  define KEY_WOW64_64KEY 0x0100
+#  define RegDeleteKeyEx(a, b, c, d) RegDeleteKey(a, b)
 # endif
 
 #define VIM_STARTMENU "Programs\\Vim " VIM_VERSION_SHORT

src/if_ole.cpp

@@ -91,6 +91,7 @@ static CVim *app = 0;
  */
 # ifndef KEY_WOW64_64KEY
 #  define KEY_WOW64_64KEY 0x0100
+#  define RegDeleteKeyEx(a, b, c, d) RegDeleteKey(a, b)
 # endif
 
 /*****************************************************************************