Load platform dependent objs instead of Linux one
This fix compilation on Gnu/Hurd and kFreeBSD
See also:
https://buildd.debian.org/status/fetch.php?pkg=ctdb&arch=hurd-i386&ver=1.12%2Bgit20120201-1&stamp=
1328211119
https://buildd.debian.org/status/fetch.php?pkg=ctdb&arch=kfreebsd-amd64&ver=1.12%2Bgit20120201-1&stamp=
1328214761
https://buildd.debian.org/status/fetch.php?pkg=ctdb&arch=kfreebsd-i386&ver=1.12%2Bgit20120201-1&stamp=
1328215875
(This used to be ctdb commit
496e8f8540f78606ef23ee8fa100eb2b2cf3f106)