SBUS: Include config.h for enabling function in stdio.h
Older versions of glibc requires extra feature macros
for function open_memstream.
fmemopen(), open_memstream(), open_wmemstream():
Since glibc 2.10:
_XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
_GNU_SOURCE
src/sbus/sssd_dbus_introspect.c: In function 'introspect_begin':
src/sbus/sssd_dbus_introspect.c:82: error: implicit declaration of function 'open_memstream'
src/sbus/sssd_dbus_introspect.c:82: warning: assignment makes pointer from integer without a cast
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>