Add build rule for build-octave (bug #49503). * src/build-octave.mk: Add new build rule for build-octave which can be used for cross-building binary packages that depend on Octave as a build tool. * dist-files.mk: Add new file to list. * index.html: Add new package to list. * src/of-communications.mk, src/of-image.mk, src/of-mapping.mk, src/of-optiminterp.mk, src/of-sparsersb.mk, src/of-statistics.mk, src/of-windows.mk: Add optional dependency on build-octave. * configure.ac: Add new configure switch "--disable-system-octave" that is needed to build the build-octave package. * Makefile.in: Add variable "USE_SYSTEM_OCTAVE". Exclude build-octave from the default build tools and build it only if a package explicitly depends on it. Display warning about missing native Octave version only if necessary.

/*
 * This file is part of MXE.
 * See index.html for further information.
 */

#include <stdio.h>
#include <gcrypt.h>

int main(int argc, char *argv[])
{
    (void)argc;
    (void)argv;

    if (!gcry_check_version (GCRYPT_VERSION)) {
        fputs ("libgcrypt version mismatch\n", stderr);
        exit (2);
    }

    gcry_control (GCRYCTL_SUSPEND_SECMEM_WARN);
    gcry_control (GCRYCTL_INIT_SECMEM, 16384, 0);
    gcry_control (GCRYCTL_RESUME_SECMEM_WARN);
    gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);

    if (!gcry_control (GCRYCTL_INITIALIZATION_FINISHED_P)) {
       fputs ("libgcrypt has not been initialized\n", stderr);
       abort ();
    }

    printf("gcrypt version: %s", GCRYPT_VERSION );

    return 0;
}