ptp: In the testptp utility, use clock_adjtime from glibc when available
ptp: In the testptp utility, use clock_adjtime from glibc when available

clock_adjtime was included in glibc 2.14. _GNU_SOURCE must be defined
to make it available.

Signed-off-by: Christian Riesch <6f14e11ac8e9ff656f870626830ae94e50dfa5a8@omicron.at>
Cc: Richard Cochran <e27030aebe9cad8817d34b8c31dbaf301fb798b9@gmail.com>
Acked-by: Richard Cochran <e27030aebe9cad8817d34b8c31dbaf301fb798b9@gmail.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs