PNGs not generated in deterministic way

[emanuelb]

Building latest android version and compare it to apk from google play result in many diffs in .png files below, probably cause build process optimize the PNG, which should be avoided, see disabling cruncherEnabled at: https://f-droid.org/en/docs/Reproducible_Builds/#png-crushcrunch or maybe need other setting like vectorDrawables.useSupportLibrary = true, etc..

Files ./gp/res/drawable/gradient.png and ./coindwallet_rebuild/res/drawable/gradient.png differ
Files ./gp/res/drawable-hdpi-v4/ic_launcher_background.png and ./coindwallet_rebuild/res/drawable-hdpi-v4/ic_launcher_background.png differ
Files ./gp/res/drawable-ldpi-v4/ic_launcher_background.png and ./coindwallet_rebuild/res/drawable-ldpi-v4/ic_launcher_background.png differ
Files ./gp/res/drawable-mdpi-v4/ic_launcher_background.png and ./coindwallet_rebuild/res/drawable-mdpi-v4/ic_launcher_background.png differ
Files ./gp/res/drawable-xhdpi-v4/ic_launcher_background.png and ./coindwallet_rebuild/res/drawable-xhdpi-v4/ic_launcher_background.png differ
Files ./gp/res/drawable-xxhdpi-v4/ic_launcher_background.png and ./coindwallet_rebuild/res/drawable-xxhdpi-v4/ic_launcher_background.png differ
Files ./gp/res/drawable-xxxhdpi-v4/ic_launcher_background.png and ./coindwallet_rebuild/res/drawable-xxxhdpi-v4/ic_launcher_background.png differ
Files ./gp/res/mipmap-hdpi-v4/ic_launcher.png and ./coindwallet_rebuild/res/mipmap-hdpi-v4/ic_launcher.png differ
Files ./gp/res/mipmap-hdpi-v4/ic_launcher_round.png and ./coindwallet_rebuild/res/mipmap-hdpi-v4/ic_launcher_round.png differ
Files ./gp/res/mipmap-hdpi-v4/logo.png and ./coindwallet_rebuild/res/mipmap-hdpi-v4/logo.png differ
Files ./gp/res/mipmap-mdpi-v4/ic_launcher.png and ./coindwallet_rebuild/res/mipmap-mdpi-v4/ic_launcher.png differ
Files ./gp/res/mipmap-mdpi-v4/ic_launcher_round.png and ./coindwallet_rebuild/res/mipmap-mdpi-v4/ic_launcher_round.png differ
Files ./gp/res/mipmap-mdpi-v4/logo.png and ./coindwallet_rebuild/res/mipmap-mdpi-v4/logo.png differ
Files ./gp/res/mipmap-xhdpi-v4/ic_launcher.png and ./coindwallet_rebuild/res/mipmap-xhdpi-v4/ic_launcher.png differ
Files ./gp/res/mipmap-xhdpi-v4/ic_launcher_round.png and ./coindwallet_rebuild/res/mipmap-xhdpi-v4/ic_launcher_round.png differ
Files ./gp/res/mipmap-xhdpi-v4/logo.png and ./coindwallet_rebuild/res/mipmap-xhdpi-v4/logo.png differ
Files ./gp/res/mipmap-xxhdpi-v4/ic_launcher.png and ./coindwallet_rebuild/res/mipmap-xxhdpi-v4/ic_launcher.png differ
Files ./gp/res/mipmap-xxhdpi-v4/ic_launcher_round.png and ./coindwallet_rebuild/res/mipmap-xxhdpi-v4/ic_launcher_round.png differ
Files ./gp/res/mipmap-xxhdpi-v4/logo.png and ./coindwallet_rebuild/res/mipmap-xxhdpi-v4/logo.png differ
Files ./gp/res/mipmap-xxxhdpi-v4/ic_launcher.png and ./coindwallet_rebuild/res/mipmap-xxxhdpi-v4/ic_launcher.png differ
Files ./gp/res/mipmap-xxxhdpi-v4/ic_launcher_round.png and ./coindwallet_rebuild/res/mipmap-xxxhdpi-v4/ic_launcher_round.png differ
Files ./gp/res/mipmap-xxxhdpi-v4/logo.png and ./coindwallet_rebuild/res/mipmap-xxxhdpi-v4/logo.png differ