2014-10-13  Carlos Eduardo Seo <contact@carlosseo.com>

	* toolchain-bootstrap.sh: Added stage for kernel headers
	build.
	* build/kernel_headers_1.sh: New file.
	* configs/config-x86_64.sample: Added options for kernel
	headers build.
	* fetch/download.sh: Moved sourcing of config file to
	toolchain-bootstrap.sh.