Flatten versioned .so.x.y.z files so they can be included in an apk

[marcprux]

The termux library dependencies include various shared object files that utilize the convention of having the base .so link to a version-suffixed file name. This works fine when running command-line executables on an Android device, but embedding the files in an Android apk will fail, both because the Android Gradle Plugin and the ART ignore everything not matching "lib*.so" in the .apk file's JNI libraries.

The error will look something like this when using a native Swift library that uses FoundationNetworking:

java.lang.UnsatisfiedLinkError: dlopen failed: library "libz.so.1" not found: needed by /data/app/~~W13d9DU_6Dw1D9JyCFe4Qg==/skip.droid.app-WSsoFlAqxhPx6In_xOnoGg==/base.apk!/lib/arm64-v8a/libcurl.so in namespace clns-6
    at java.lang.Runtime.loadLibrary0(Runtime.java:1082)
    at java.lang.Runtime.loadLibrary0(Runtime.java:1003)
    at java.lang.System.loadLibrary(System.java:1661)
    at skip.droid.AndroidAppMain.onCreate(Main.kt:78)
    at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1316)
    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6998)
    at android.app.ActivityThread.-$$Nest$mhandleBindApplication(Unknown Source:0)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2236)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loopOnce(Looper.java:205)
    at android.os.Looper.loop(Looper.java:294)
    at android.app.ActivityThread.main(ActivityThread.java:8177)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:971)

This solution walks through each of the termux libraries and identifies which ones are version-suffixed, and moves them to the non-version suffixed base name. It also uses patchelf to update the soname for the renamed files, as well as update the needed sections for any peer libraries so they point to the correct names.

For more information and other approaches, see https://stackoverflow.com/questions/62450784/link-in-android-studio-with-shared-libraries-with-versioning and https://gist.github.com/Sotatek-TuyenLuu/2f89b2a6690989b0550ea7d409d4e9f3.