The source line numbers in the log messages are transformed by R8 in
the complex way, that requires `mapping.txt` to recover the real number.
Disable R8 optimizations for now until we figure out how to maintain
the history of `mapping.txt` for all releases.
Closes#6559
Signed-off-by: Roman Tsisyk <roman@tsisyk.com>
R8 is not enabled for Debug, please test Beta or Release:
```
./gradlew -Parm64 runFdroidBeta
```
Results:
```
48534296 fdroid-beta-before.apk
45663208 fdroid-beta-after.apk
```
This patch saves almost 3MB or ~6%.
Signed-off-by: Roman Tsisyk <roman@tsisyk.com>