weston build on older linuxes, where CLOCK_BOOTTIME is not available. trivial patch attached.

[Volker Eckert]

hi all,

i can successfully build weston on debian 7 (kernel 3.2.0-4, glibc 2.13-38), if i make the use of CLOCK_BOOTTIME conditional on its availabilty (see patch). this might also apply on other older systems (certainly centos 6.5 is affected) and in terms of portability it probably makes sense to #ifdef all of the linux specific ones in the first place (?)

cheers,
Volker


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