v7.8.1

1. Rename libv8.so to libv8android.so to prevent v8executor use system libv8.so and crash from unresolved symbol.
   Kudo/react-native-v8#29
2. Upgrade V8 to 7.8.279.23

Breaking Changes

Since libv8.so is renamed, this is yet another breaking changes.
Please use one of these react-native-v8 versions.

v0.59.10-patch.4
v0.60.6-patch.2
v0.61.1-patch.3
v0.61.2-patch.1
v0.61.3-patch.1
v0.61.4-patch.1