Support for systems without [gs]etitimer API

Hi,

After enabling the testsuite execution when building Debian packages I noticed that the testsuite fails on Debian/Hurd. Every testcase was failing with Unix_error exception, because while Hurd has getitimer function, it just returns ENOSYS error there.

The attached patch detects whether the system has working getitimer function, and if not, makes coccinelle use alarm() API instead.

With this patch coccinelle builds fine on all Debian architectures with 386 successful test cases (expected: 377).

Regards,
Eugeniy Meshcheryakov
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Applied. Thanks!

julia