Patch wrong tls alignment for Android Q compatibility (fixes #370)

[Catfriend1]

Purpose:

• Patch wrong tls alignment for Android Q compatibility (fixes Android Q Beta - Wrong Bionic TLS alignment (golang) #370)

Testing:
Needs confirmation from device owners having the following arch:

• armeabi (arm32)
• arm64-v8a (arm64)
• Doesn't work (as before of the PR) on Android x86 emulator running Android Q (10)

Here's the test APK (see release page). Please leave feedback with your device manufacturer, model, architecture and Android version. Would appreciate also users below Android 10 reporting back before merging this.

Thanks!

[Catfriend1]

@kvaster: Thanks for your contribution. It doesn't work on x86. Your code is far better than mine because you dynamically determine which byte to change. I've already found out yesterday by try & readelf that your above mentioned positions of the byte aren't static across builds (had 0x150 instead of 0x14c for example). I've incorporated your script into the native build script. Builds fine, but now I need feedback from armeabi and arm64-v8a device testers before releasing it.

Here's the new build log.

Invoking git fetch ...
Invoking git describe ...
Building for arm
Building syncthing version v1.1.0
artifact_patch_underaligned_tls: Patching underaligned TLS segment from 4 to 32
Finished build for arm
Building for arm64
Building syncthing version v1.1.0
artifact_patch_underaligned_tls: Patching underaligned TLS segment from 8 to 64
Finished build for arm64
Building for x86
Building syncthing version v1.1.0
Finished build for x86
All builds finished


BUILD SUCCESSFUL in 20s
1 actionable task: 1 executed

[Catfriend1]

@kvaster: The script doesn't work with Python 2.7 ... I'm trying to make adjustments for better compatibility as I think F-Droid might have 2.7 on their build env.

[Catfriend1]

See release page. https://github.com/Catfriend1/syncthing-android/releases

[Mygod]

Any chance this change will be merged to golang?