Add BuildRequires on gcc-c++

nordugrid-arc-botrequested to merge
ellert/arc:br-c++-and-pylint into next-major

**[This merge request is automatically copied from !33 (merged) orginally made by @ellert **]

  • Add BuildRequires on gcc-c++
  • Use pylint in EPEL 7 (it's back)

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