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Description of problem:
scols_print_table_to_string() doesn't work

Version-Release number of selected component (if applicable):
libsmartcols-2.23.2-59.el7.x86_64

Steps to Reproduce:
// gcc reproducer.c -I /usr/include/libsmartcols -l smartcols; ./a.out

#include "libsmartcols.h"

int main(int argc, char *argv[])
{
    struct libscols_table *tb;
    char * out;

    tb = scols_new_table();
    scols_table_new_column(tb, "DATA", 0, 0);

    struct libscols_line *ln = scols_table_new_line(tb, NULL);
    scols_line_set_data(ln, 0, "foo");

    printf("print directly:\n");
    scols_print_table(tb);

    printf("\n");

    printf("print via string:\n");
    scols_print_table_to_string(tb, &out);
    printf("%s", out);

    scols_unref_table(tb);
    return 0;
}

Actual results:
table is printed only once
then garbage is printed

Expected results:
table is printed twice, scols_print_table_to_string() works


Additional info:
It seems that HAVE_OPEN_MEMSTREAM macro isn't set properly and the library gets compiled with a dummy function that returns -ENOSYS.

It seems I have forgot to backport (when worked on bug #1561350)
 AC_CHECK_FUNCS([open_memstream], [have_open_memstream=yes],[have_open_memstream=no])
into RHEL7 configure.ac :-(((

Easy fix.

*** Bug 1687453 has been marked as a duplicate of this bug. ***

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:2252