[Halld-offline] ROOT 6 incompatibility with GCC 5

[Nathan Sparks]

This issue came up at the Calibration meeting today.
Here is a brief summary with some links for those who want more details.

Important: This issue only affects those using ROOT with GCC 5 or higher, not GCC 4.8 or 4.9.

GCC 5 introduced a new C++ ABI:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html <https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html>

Currently, ROOT 6 releases are incompatible with GCC 5 or higher because they do support the new ABI (specifically, Cling 0.2 does not).
https://sft.its.cern.ch/jira/browse/ROOT-7947 <https://sft.its.cern.ch/jira/browse/ROOT-7947>

Support for the new ABI is supposed to land in ROOT 6.08.00, when Cling 0.3 is included, hopefully later this month.
https://github.com/root-mirror/cling/releases <https://github.com/root-mirror/cling/releases>

-Nathan
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