kexec-tools: rewrite compile and install rules.
kexec-tools: rewrite compile and install rules.

Remember the touch make is in place to make sure the binary target is more
recent than its prerequisites.

Signed-off-by: Gaël PORTAY <1666f60cfa201a60b0ea694168a0b6932673170a@gmail.com>

gazoo74/initramfs,gazoo74/initramfs