Add libmedia.so to the minimum image

libmedia.so was used by at least 2 apps included in the minimum image,
Activity Monitor and Deskcalc which subsequently failed to load on minimum.

Deskcalc wasn't actually using libmedia.so so I managed to get it to link and
run on minimum, however, Activity Monitor is using libmedia.so so needed it
to be present.

To fix this I added libmedia.so to the minimum image, I hope this does not blow
its size budget. (adds 1.0MB)

build/jam/images/definitions/minimum

@@ -91,6 +91,7 @@ rule HaikuImageGetSystemLibs
 			libdebugger.so@primary
 			libdevice.so
 			libgnu.so
+			libmedia.so
 			libnetwork.so
 			libpackage.so
 			libtextencoding.so libtracker.so libtranslation.so