Remove Phoenix v2 scaffolding.

Since the introduction of Phoenix v3 (in boost 1.47) the 'result' struct is no longer needed in spirit parser. See eg. http://www.boost.org/doc/libs/1_47_0/libs/phoenix/doc/html/phoenix/what_s_new/phoenix_3_0.html which points out the switch to the 'Boost::Result_of' protocol

• [2017-10-17 16:56] Validation started with lhcb-gaudi-merge#247
• [2017-10-18 00:04] Validation started with lhcb-future#570
• [2017-10-18 00:04] Validation started with lhcb-future-clang#346
• [2017-10-19 00:02] Validation started with lhcb-future#571
• [2017-10-19 00:03] Validation started with lhcb-future-clang#347

mentioned in merge request lhcb/LHCb!923 (merged)

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• 00d64778 - Remove Phoenix v2 scaffolding.

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approved this merge request

assigned to @hegner

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mentioned in commit 8773eded

changed milestone to %v30r0

added C++ framework label