Haikuwebkit: explicitly require cmake 3.
Haikuwebkit: explicitly require cmake 3.

* Our version of CMake 3 include many fixes that are not backported to
2.8. One of these is needed to make cmake --system-information work.
This is used by the WebKit build to detect the number of processors.

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