redhat/kernel.spec: don't clear entire libdir when building cpupower

Jan Stancekrequested to merge
jstancek/kernel-ark:dont_clear_everything into os-build

cpupower build commands currently clear out entire libdir, wiping out any other libraries that might be built before. It causes an issue for upcoming ynl subpackage, which also puts a library into libdir.

Signed-off-by: Jan Stancek jstancek@redhat.com

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