muscle: Also add headers to the _devel package
muscle: Also add headers to the _devel package

I'm not sure which ones we need, so I'll put them all for now.

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