cmake: Update 2.8 patchset to undo most of elf.h sepcial casing.
cmake: Update 2.8 patchset to undo most of elf.h sepcial casing.

Haiku now provides a public elf.h and the special casing lead to build
failures on current x86_gcc2.

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