mpi: Add mpi_snatch and change an internal typedef.
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Description

mpi: Add mpi_snatch and change an internal typedef.

* src/mpi.h (struct mpi_point_s): Rename to struct gcry_mpi_point.
(mpi_point_struct): New typedef.
(mpi_point_t): Change typedef to a pointer.  Replace all occurrences
to use mpi_point_struct.
* mpi/ec.c (_gcry_mpi_ec_point_init): Rename to ..
(_gcry_mpi_point_init): this.  Change all callers.
(_gcry_mpi_ec_point_free): Rename to ..
(_gcry_mpi_point_free_parts): this.  Change all callers.
* mpi/mpiutil.c (gcry_mpi_snatch): New function.
* src/gcrypt.h.in (gcry_mpi_snatch, mpi_snatch): Add protoype and
macro.
* src/visibility.c (gcry_mpi_snatch): Add wrapper.
* src/visibility.h (gcry_mpi_snatch): Add macro magic.
* src/libgcrypt.def, src/libgcrypt.vers: Add new function.

This patch is a prerequisite to implement a public point API. The new
function gcry_mpi_snatch is actually not needed for this but is useful
anyway and will be used to implement the point API.