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This set of changes makes libevl y2038-safe by switching to the ABI
revision 19 of the EVL core, which generalizes the use of a 64bit
timespec type. These changes also go a long way preparing for the
upcoming mixed 32/64 ABI support (aka compat mode).

The changes only affect the internal interface between libevl and the
kernel, not the API.  Nevertheless, the API was bumped to revision 10
with the removal of the evl_adjust_clock() service, which neither had
proper specification nor defined use case currently, but would stand
in the way of the sanitization work for y2038. At any rate, any future
service implementing some sort of EVL clock adjustment should
definitely not depend on the legacy struct timex which is
y2038-unsafe.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>