revive the version check of ndk (#3354)
revive the version check of ndk (#3354)

* revive the version check of ndk in order not to waste our time by using wrong version of NDK.

* minor fix

* minor fix

* move 'checkNdk(ndkPathInLocalProperties)' to ensure the existance of the directory when obtainig canonical path

realm/realm-java,realm/realm-java,realm/realm-java,realm/realm-java,realm/realm-java,realm/realm-java,realm/realm-java