Revert "Add support for reading multi string values to wxRegKey."

Reverts r78136 (see #15727) because the multi-string values in Windows
registry are actually not "name=value" pairs at all but just NUL-separated
strings and the API provided for reading them was inappropriate.

Also see #16719.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78326 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/msw/registry.h

@@ -355,18 +355,6 @@ public:
     */
     bool QueryValue(const wxString& szValue, wxMemoryBuffer& buf) const;
 
-    /**
-        Retrieves a multiple string value.
-
-        The @a szValue must exist and have @c REG_MULTI_SZ type. The names and
-        the values of the pairs present in it are returned in the @a names and
-        @a value arrays, which will have the same (possible 0) size.
-
-        @since 3.1.0
-     */
-    bool QueryValue(const wxString& szValue,
-                    wxArrayString& names,
-                    wxArrayString& values) const;
     /**
         Renames the key. Returns @true if successful.
     */