allways create /conf/dialplan/extensions on install

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@7279 d0543943-73ff-0310-b7d9-9358b9ac24b2

Makefile.am

@@ -170,6 +170,7 @@ $(switch_builddir)/quiet_libtool: $(switch_builddir)/libtool
 
 samples-conf:
 	test -d $(DESTDIR)$(prefix)/conf || $(mkinstalldirs) $(DESTDIR)$(prefix)/conf
+	test -d $(DESTDIR)$(prefix)/conf/dialplan/extensions || $(mkinstalldirs) $(DESTDIR)$(prefix)/conf/dialplan/extensions
 	for conffile in `find conf -name \*.xml && find conf -name \*.conf && find conf -name \*.tpl  && find conf -name \*.ttml && find conf -name mime.types` ; do \
 		dir=`echo $$conffile | sed -e 's|/[^/]*$$||'`; \
 		filename=`echo $$conffile | sed -e 's|^.*/||'`; \