Fix solid build against libudev < 167

Review Request #113404 - Created Oct. 23, 2013 and submitted - Latest diff uploaded

Information
Rex Dieter
kdelibs
master
Reviewers
solid
afiestas
Afiestas suggested improving on
https://projects.kde.org/projects/kde/kdelibs/repository/revisions/a8d3d3321522d35c2852abb02a475c6b43be5cfe
To fix build against libudev < 167 , instead of disabling udev solid backend altogether, only omit the piece that needs the newer api.

Gratuitously added pkgconfig HINTS too, but can omit that part if it is considered unwanted.
Builds now succeed on rhel6/centos6 hosts that failed previously.
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