A few tweaks to make Ardour build in GCC -std=c++0x mode.

git-svn-id: svn://localhost/ardour2/branches/3.0@11983 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/evoral/src/ControlList.cpp

@@ -679,7 +679,7 @@ ControlList::modify (iterator iter, double when, double val)
 		(*iter)->when = when;
 		(*iter)->value = val;
 
-		if (isnan (val)) {
+		if (std::isnan (val)) {
 			abort ();
 		}