Explicitly set ndkVersion to Flutter's

[emersion]

Without this, webcrypto.dart uses AGP's default NDK version, which can be different from Flutter's preferred NDK version. Apart from causing builds to download multiple NDKs needlessly, this also causes APKs to not use 16 KB page sizes.

Tested by building an APK and opening it in Android Studio's APK analyzer.

Closes: #239

[delthas]

I was actually writing the same patch but you were first 😛

[HamdaanAliQuatil]

thanks for this 🚀

[emersion]

@jonasfj If you have time, it would be great to have a new release with this fix!

[emersion]

@jonasfj Gentle ping, would be nice to have this available on the published package - this is blocking Google Play submissions for all Flutter apps using this library :P

[olof-dev]

Can confirm that this fixed the issue for me: the check_elf_alignment.sh script (see https://developer.android.com/guide/practices/page-sizes) reports
lib/arm64-v8a/libwebcrypto.so: ALIGNED (2**14)
after this change, instead of the UNALIGNED (2**12) without the fix. As @emersion writes, Google Play Console flags a policy violation if it is unaligned, so an updated release on pub.dev would be very welcome.