Lift java version => gradle version
Hello, I am trying to build simple android app on windows-10

```cmd
nimble install nimx
mkdir test_android && cd test_android
echo 'echo "test"' > main.nim
echo 'import nimx/naketools' > nakefile.nim
set ANDROID_NDK_HOME=C:\opt\android-ndk-r20b
set ANDROID_SDK_HOME=C:\opt\sdk-tools-windows-4333796
set SDL_HOME=C:\opt\SDL2-2.0.10
```

if I use java 13:
```cmd
set JAVA_HOME=C:\opt\jdk-13.0.1
nake droid
```

then gradle complains: Could not determine java version from '13.0.1'. The same for '12'.
**Q: Is it possible to lift gradle to something more modern?**

If I use java 7 (which is supported for gradle 4.5)

```cmd
set JAVA_HOME=C:\opt\java-se-7u75-ri
nake droid
```

Then there is another problem:
```
 Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.5.2/gradle-3.5.2.pom'.
               > java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
```
something wrong with certificates.


