Please add support for armeabi-v7a

[dankito]

com.zsmarter:Tess4Android only supports arm64-v8a.

But there are still a lot of devices out there running on armeabi-v7a. Could you please also add support for it?

(Instead of defining

APP_ABI := arm64-v8a

in Application.mk use

APP_ABI := arm64-v8a armeabi-v7a

.)

Thanks a lot!