api: New function gcry_mpi_point_copy.
* src/gcrypt.h.in (gcry_mpi_point_copy): New. (mpi_point_copy): New macro. * src/visibility.c (gcry_mpi_point_copy): New. * src/libgcrypt.def, src/libgcrypt.vers: Add function. * mpi/ec.c (_gcry_mpi_point_copy): New. * tests/t-mpi-point.c (set_get_point): Add test.
- Signed-off-by: Werner Koch <wk@gnupg.org>