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
When trying to linking curve_keygen as if it was a C program, linking fails (at least with gcc 4.8 on Debian testing) because it can't find C++ symbols. Linking with g++ instead fixes the issue. To achieve this, the source is renamed to curve_keygen.cpp, and tools/Makefile.am is updated accordingly. Signed-off-by: Gergely Nagy <algernon@balabit.hu>