Flag incompatible_remove_native_http_archive

We're moving away from the native familty of http_archive functions to the Starlark version of http_archive. The new function can be loaded with load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive") and provides the same functionality; in fact, patching and programatic transformations of the repository are available as well.

By this change we remove duplicate functionality and switch from native rules to more flexible and more easy to maintain Starlark implementations of the same functionality.