Add HaikuWebkit 1.2.3 recipe.
Add HaikuWebkit 1.2.3 recipe.

Sources are now downloaded from github using the "release" feature which
genrates a tar.gz archive from a tag.

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