doc: factor hard-coded project-specific bits from README-release, ...

using the new --mail-headers option to gnulib's announce-gen, and
the updated maint.mk rules to connect the pieces.
* README-release: Remove hard-coded To:, Cc: etc. parts, now
that they're emitted automatically into the announcement template.
* cfg.mk (announcement_Cc_): Override the default.
* gnulib: Update to latest, to get newer announce-gen and maint.mk.

1 files changed, 4 insertions, 0 deletions

diff --git a/cfg.mk b/cfg.mk
index 679ea8e2f..9eb1c9e85 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -331,6 +331,10 @@ sc_space_before_open_paren:
 	else :;								\
 	fi
 
+# Override the default Cc: used in generating an announcement.
+announcement_Cc_ = $(translation_project_), \
+  coreutils@gnu.org, coreutils-announce@gnu.org
+
 include $(srcdir)/dist-check.mk
 
 update-copyright-env = \