Fix gnuplot recipe
Fix gnuplot recipe

- Added missing dependencies libiconv and libtiff

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