Steps to reproduce:

1) Download attached project and open in Unity
2) Make sure Development Build is disabled in the Build Settings
3) Go to Player Settings >> Other Settings >> Configuration >> and set Target Architecture to ARMv7
4) Click on Build button in the Build Settings
Note: Build should be successful
5) Go to Player Settings >> Other Settings >> Configuration >> and change Target Architecture to ARM64
6) Click on Build button in the Build Settings

Note: Build will fail with the following error:

CommandInvokationFailure: Gradle build failed.
C:\Program Files\Java\jdk1.8.0_151\bin\java.exe -classpath "E:\Program Files\2018.1\2018.1.0f1_5a5868b1cfa9\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-4.0.1.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx2048m" "assembleRelease"

stderr[

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':transformNativeLibsWithStripDebugSymbolForRelease'.
> java.io.IOException: Failed to delete C:\Users\Ernestas\Downloads\case_1027934-InstantGame\Temp\gradleOut\build\intermediates\transforms\stripDebugSymbol\release\folders\2000\1f\main\lib\arm64-v8a

Expected result: Build should be successful, without java.io.IOException
Actual result: Build fails with java.io.IOException

Reproduced with:
2018.1.0b2, 2018.1.0b5, 2018.1.0b10, 2018.1.0f1

Not reproduced with:
2018.2.0b1

ARM64 architecture was introduced in 2018.1.0b2

Tested using Windows 10 machine