readline: Enable x86_64, add checksums
readline: Enable x86_64, add checksums

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