Clean up for removal of memory guard support.
* mpi/mpiutil.c (_gcry_mpi_m_check): Remove. * src/g10lib.h (_gcry_check_heap): Remove. * src/global.c (_gcry_check_heap): Remove. * src/mpi.h (mpi_m_check): Remove.
- GnuPG-bug-id: T5822
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>