Don't strip debug symbols for debug build!
Don't strip debug symbols for debug build!

From Android Plugin Version 2.2.0, it tries to strip debug symbols of
native libs for all build types (even debug build!!??).
I don't like something try to be smart, so just let our cmake handler
stripping and backup the unstripped libs.

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