Gradle version: any
Android Plugin Version: 3.0.0-beta3, beta4
Module Compile Sdk Version: any
Module Build Tools Version: 26
Android SDK Tools version:

CMake documentation https://developer.android.com/ndk/guides/cmake.html clearly states that users can specify the path of `android.toolchain.cmake` by passing `-DCMAKE_TOOLCHAIN_FILE=...` option to `android.defaultConfig.externalNativeBuild.cmake.arguments`.

However, android gradle plugin 3.0.0-beta3 or later unconditionally adds their own `-DCMAKE_TOOLCHAIN_FILE=...` option unconditionally and therefore user specified option is always overwritten.

I saw following output in our build log:

```
Error while executing process /Users/zaki/Library/Android/sdk/cmake/3.6.4111459/bin/cmake with arguments {-H/Users/zaki/ghq/github.com/realm/realm-java-releases/realm/realm-library/src/main/cpp -B/Users/zaki/ghq/github.com/realm/realm-java-releases/realm/realm-library/.externalNativeBuild/cmake/baseDebug/x86

...

-DCMAKE_TOOLCHAIN_FILE=/Users/zaki/ghq/github.com/realm/realm-java-releases/realm/realm-library/src/main/cpp/android.toolchain.cmake

...

-DCMAKE_TOOLCHAIN_FILE=/Users/zaki/Library/Android/sdk/cmake/3.6.4111459/android.toolchain.cmake -DANDROID_NDK=/Users/zaki/Library/Android/android-ndk-r10e -GAndroid Gradle - Ninja}
```

Issue 65336086

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