Add estream code from GnuPG.
* src/estream-printf.c, src/estream-printf.h: New. * src/estream.c, src/estream.h: New. * m4/estream.m4: New. * src/Makefile.am (libgpg_error_la_SOURCES): Add new files. * configure.ac (AH_BOTTOM): Define estream prefix. <gcc>: Add useful gcc warning options. (estream_INIT): Call.
This is the base line patch to move the estream code from GnuPG to
libgpg-error. The code has been taken from the GnuPG repository at
commit cb680c5ea540738692a5c74951802b0fdc658e85.
- Signed-off-by: Werner Koch <wk@gnupg.org>