Include config.h in private header
Include config.h in private header

atspi-misc.c was not including config.h anywhere, resulting in HAVE_X11
not being defined, so X would not be queried when fetching the
accessibility bus address.

https://bugzilla.gnome.org/show_bug.cgi?id=707084

GNOME/at-spi2-core,GNOME/at-spi2-core,GNOME/at-spi2-core