fdo#75757: remove inheritance to std::vector

Typedef'ing SvxXMLListStyle_Impl is enough.

Change-Id: I281766822aea60794510c959581f0b821aea6642
Reviewed-on: https://gerrit.libreoffice.org/10729Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

include/xmloff/xmlnumi.hxx

@@ -27,7 +27,8 @@
 
 namespace com { namespace sun { namespace star { namespace frame { class XModel; } } } }
 class SvI18NMap;
-class SvxXMLListStyle_Impl;
+class SvxXMLListLevelStyleContext_Impl;
+typedef std::vector<SvxXMLListLevelStyleContext_Impl *> SvxXMLListStyle_Impl;
 
 class SvxXMLListStyleContext : public SvXMLStyleContext
 {

xmloff/source/style/xmlnumi.cxx

@@ -1006,8 +1006,6 @@ SvxXMLListLevelStyleLabelAlignmentAttrContext_Impl::~SvxXMLListLevelStyleLabelAl
 {
 }
 
-class SvxXMLListStyle_Impl : public std::vector<SvxXMLListLevelStyleContext_Impl *> {};
-
 void SvxXMLListStyleContext::SetAttribute( sal_uInt16 nPrefixKey,
                                            const OUString& rLocalName,
                                            const OUString& rValue )