AtlasLCG: Add Findxz to AtlasLCG.

We need this in order include lzma (xz) support in gdb. The system version available on slc6 is too old, but the one built in LCG works.

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Some problem related to linking fastjet? Not clear that it has anything to do with this change.

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mentioned in merge request !276 (merged)

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• a344049b - Fix cmake variable name: XZ_INCLUDE_DIRS->XZ_INCLUDE_DIR

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mentioned in commit 7937e42e

mentioned in commit 99f0bfe2

mentioned in merge request !279 (merged)