yaml_cpp: added recipe for version 0.5.1
yaml_cpp: added recipe for version 0.5.1

koletzky/haikuports,nielx/haikuports,moochris/haikuports,miqlas/haikuports,haikuports/haikuports,miqlas/haikuports,haikuports/haikuports,Begasus/haikuports,moochris/haikuports,nielx/haikuports,moochris/haikuports,Begasus/haikuports,miqlas/haikuports,haikuports/haikuports,Begasus/haikuports,haikuports/haikuports,Begasus/haikuports,Begasus/haikuports,koletzky/haikuports,koletzky/haikuports,nielx/haikuports,haikuports/haikuports