Gcc6 fixes#62

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ghost wants to merge 8 commits intoopen-power:master-p8from

stewartsmith:gcc6-fixes

Commits on Nov 3, 2016

Default to std=gnu++03
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fix build error: return-statement with a value, in function returning 'void'
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error: dereferencing type-punned pointer will break strict-aliasing rules
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Change cv_forcedMemPeriodic to int as bool is invalid
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error: the compiler can assume that the address of ‘r’ will never be NULL
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Fix compiler can assume address will never be NULL error with GCC6
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error: in C++98 ‘l_vmVersionBuf’ must be initialized by constructor
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Use -std=gnu++03 for host g++ invocations
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