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 <curl/curl.h>

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

    (void)argc;
    (void)argv;

    curl = curl_easy_init();
    if (!curl) {
        return 1;
    }

    curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/");
    curl_easy_perform(curl);

    curl_easy_cleanup(curl);
    return 0;
}