Wrong signature for axpy blas functions

[finkandreas]

In the file src/impl/tpls/KokkosBlas1_axpby_tpl_spec_decl.hpp the function axpy is declared as

extern "C" void daxpy_( const int* N, const double* alpha,
                                      const double* x, const int* x_inc,
                                      const double* y, const int* y_inc);

but it should be:

extern "C" void daxpy_( const int* N, const double* alpha,
                                      const double* x, const int* x_inc,
                                      double* y, const int* y_inc);

The second last argument is an output argument, so it shall not be const. This applies also to the other axpy functions.

[mhoemmen]

Fix in PR #329. btw @finkandreas GitHub lets you submit a PR with just a few clicks -- you can edit the file in the browser -- so please feel free to submit a fix for issues like this if you like :-)

[ndellingwood]

PR #329 with fix by @mhoemmen merged.