core: Avoid using estream_t in the public API.
* src/gpg-error.h.in: Always use gpgrt_stream-t.
estream_t can only be used if GPGRT_ENABLE_ES_MACROS is defined.
- Fixes-commit: 1865c0ba1769b407a3c504f1ab0a4278704a9fc1
- Signed-off-by: Werner Koch <wk@gnupg.org>