kexec-tools-klibc_2.0.2: refactor and extend patches for building

* some old patches apparently unneeded have been removed
* patches are now better split
* fix build for x86 and x86-64
* tested with qemuarm, qemuppc, qemumips, qemux86, qemux86-64

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>