return HDMI physical address using EDID data retrieved from X11 randr ex...

...tension
Building this on OpenELEC for R-Pi (ie. without X11) results in the following build error:
```
checking for bcm_host_init in -lbcm_host... yes
checking X11/Xlib.h usability... no
checking X11/Xlib.h presence... no
checking for X11/Xlib.h... no
checking X11/Xatom.h usability... no
checking X11/Xatom.h presence... no
checking for X11/Xatom.h... no
checking X11/extensions/Xrandr.h usability... no
checking X11/extensions/Xrandr.h presence... no
checking for X11/extensions/Xrandr.h... no
checking for XOpenDisplay in -lX11... no
checking for XRRGetScreenResources in -lXrandr... no
checking algorithm usability... yes
...
checking that generated files are newer than configure... done
configure: error: conditional "USE_X11_RANDR" was never defined.
Usually this means the macro was only invoked conditionally.
make: *** [release] Error 1
```

The following patch seems to do the trick, is this the correct fix?
```
--- a/configure.ac	2014-10-25 15:40:49.972645020 +0100
+++ b/configure.ac	2014-10-25 15:41:12.904644410 +0100
@@ -226,6 +226,7 @@
       AM_CONDITIONAL(USE_X11_RANDR, true)
     else
       LIBS="$libs_tmp"
+      AM_CONDITIONAL(USE_X11_RANDR, false)
     fi
     ;;
   *-apple-darwin*)
```