Don't use cp -H in chapter 5 - kernel headers

[gerard@…]

Host system's cp might not understand the -H option. Mandrake 8.x is reported to have fileutils-4.0p that doesn't have the -H option built-in.

Revert to these commands instead for the chapter 5 - kernel headers. Chapter 6 can remain unchanged as we install a recent coreutils now that does know about cp -H

make mrproper && make include/linux/version.h && make symlinks && mkdir /stage1/include/asm && cp include/asm/* /stage1/include/asm && cp -R include/asm-generic /stage1/include && cp -R include/linux /stage1/include && touch /stage1/include/linux/autoconf.h