Avoid dprintf conflict.
Avoid dprintf conflict.

dprintf is part of XPG7 (X/Open 2008), but zbar #defines a conflicting
 one to use for debug printing.
This just makes sure <stdio.h> is included before the macro is defined,
 so that the declaration in that header is processed before zbar's
 macro.
Fixes issue 3122916:
 http://sourceforge.net/tracker/?func=detail&atid=928516&aid=3122916&group_id=189236

crystax/cosp-android-zbar,crystax/cosp-android-zbar,robertwalker/zbar,robertwalker/zbar,AquaGeek/zbar,AquaGeek/zbar,AquaGeek/zbar,crystax/cosp-android-zbar,bobftw/zbarSDK,bobftw/zbarSDK,dmcrystax/cosp-android-zbar,dmcrystax/cosp-android-zbar,bobftw/zbarSDK,crystax/cosp-android-zbar,AquaGeek/zbar,dmcrystax/cosp-android-zbar,crystax/cosp-android-zbar,AquaGeek/zbar,dmcrystax/cosp-android-zbar,robertwalker/zbar,dmcrystax/cosp-android-zbar,bobftw/zbarSDK,bobftw/zbarSDK,dmcrystax/cosp-android-zbar,robertwalker/zbar,robertwalker/zbar,AquaGeek/zbar,crystax/cosp-android-zbar,robertwalker/zbar,AquaGeek/zbar,crystax/cosp-android-zbar,bobftw/zbarSDK,dmcrystax/cosp-android-zbar