db/upnp: use std::list instead of std::set for SearchCapabilities

src/db/UpnpDatabasePlugin.cxx

@@ -281,7 +281,7 @@ UpnpDatabase::SearchSongs(ContentDirectoryService &server,
 	if (selection.filter == nullptr)
 		return true;
 
-	std::set<std::string> searchcaps;
+	std::list<std::string> searchcaps;
 	if (!server.getSearchCapabilities(m_lib->getclh(), searchcaps, error))
 		return false;
 

src/db/upnp/ContentDirectoryService.cxx

@@ -188,7 +188,7 @@ ContentDirectoryService::search(UpnpClient_Handle hdl,
 
 bool
 ContentDirectoryService::getSearchCapabilities(UpnpClient_Handle hdl,
-					       std::set<std::string> &result,
+					       std::list<std::string> &result,
 					       Error &error)
 {
 	assert(result.empty());

src/db/upnp/ContentDirectoryService.hxx

@@ -23,7 +23,7 @@
 #include <upnp/upnp.h>
 
 #include <string>
-#include <set>
+#include <list>
 
 class Error;
 class UPnPDevice;
@@ -114,7 +114,7 @@ public:
 	 *     any tag can be used in a search, or a list of usable tag names.
 	 */
 	bool getSearchCapabilities(UpnpClient_Handle handle,
-				   std::set<std::string> &result,
+				   std::list<std::string> &result,
 				   Error &error);
 
 	/** Retrieve the "friendly name" for this server, useful for display. */

src/db/upnp/Util.cxx

@@ -153,7 +153,7 @@ csvToStrings(const char *s, T &tokens)
 		case ',':
 			switch(state) {
 			case TOKEN:
-				tokens.insert(tokens.end(), current);
+				tokens.push_back(current);
 				current.clear();
 				continue;
 			case ESCAPE:
@@ -187,7 +187,7 @@ csvToStrings(const char *s, T &tokens)
 	}
 	switch(state) {
 	case TOKEN:
-		tokens.insert(tokens.end(), current);
+		tokens.push_back(current);
 		break;
 	case ESCAPE:
 		return false;
@@ -195,6 +195,4 @@ csvToStrings(const char *s, T &tokens)
 	return true;
 }
 
-//template bool csvToStrings<list<string> >(const string &, list<string> &);
-template bool csvToStrings<std::vector<std::string> >(const char *, std::vector<std::string> &);
-template bool csvToStrings<std::set<std::string> >(const char *, std::set<std::string> &);
+template bool csvToStrings<std::list<std::string>>(const char *, std::list<std::string> &);