minui: Match API to AOSP

 * AOSP added a "bold" flag for image based fonts. Stay compatible
   with that API since there are other components using minui.

Change-Id: I6c0f12f7f8f1df8dd27779b47883ccff96f2d291
merge CyanogenMod

Change-Id: I279a8133df08b6686605fab43cfe0e772fc9414f