CMake: remove -Wno-vla from CXXFLAGS
Merge pull request #146 from toxeus/removeVLA

CMake: remove -Wno-vla from CXXFLAGS
containers: suppress warning with #pragma

This is necessary to successfully build opentxs-server.
Merge pull request #148 from toxeus/addPragma

containers: suppress warning with #pragma
cmake: Fix git submodule init problem on some systems