include/vzsyscalls.h: only define __NR_ioprio_set if undef
Recent distros come with includes that have __NR_ioprio_set
already defined, so let's only define it if it is missing.
Helps to avoid this warning:
warning: "__NR_ioprio_set" redefined
Signed-off-by: Kir Kolyshkin <firstname.lastname@example.org>
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Mar 17, 2011