unused variables warnings

[slayoo]

Scanning dependencies of target gtest
[ 25%] Building CXX object googletest-build/googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.o
[ 50%] Linking CXX static library ../../lib/libgtest.a
[ 50%] Built target gtest
Scanning dependencies of target test_all
[ 75%] Building CXX object test/CMakeFiles/test_all.dir/test_all.cpp.o
In file included from /home/slayoo/devel/wdm/include/wdm.hpp:11,
                 from /home/slayoo/devel/wdm/test/test_all.cpp:10:
/home/slayoo/devel/wdm/include/wdm/prho.hpp: In function ‘double wdm::impl::prho(std::vector<double>, std::vector<double>, std::vector<double>)’:
/home/slayoo/devel/wdm/include/wdm/prho.hpp:45:45: warning: unused variable ‘wi_sq’ [-Wunused-variable]
     double v_x = 0.0, v_y = 0.0, cov = 0.0, wi_sq;
                                             ^~~~~
/home/slayoo/devel/wdm/test/test_all.cpp: In function ‘int main(int, char**)’:
/home/slayoo/devel/wdm/test/test_all.cpp:13:14: warning: unused parameter ‘argc’ [-Wunused-parameter]
 int main(int argc, char **argv) {
          ~~~~^~~~
/home/slayoo/devel/wdm/test/test_all.cpp:13:27: warning: unused parameter ‘argv’ [-Wunused-parameter]
 int main(int argc, char **argv) {
                    ~~~~~~~^~~~