merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 12 insertions, 0 deletions

diff --git a/third_party/git/Documentation/config/fmt-merge-msg.txt b/third_party/git/Documentation/config/fmt-merge-msg.txt
index c73cfa90b70c..3fbf40e24f62 100644
--- a/third_party/git/Documentation/config/fmt-merge-msg.txt
+++ b/third_party/git/Documentation/config/fmt-merge-msg.txt
@@ -8,3 +8,15 @@ merge.log::
 	most the specified number of one-line descriptions from the
 	actual commits that are being merged.  Defaults to false, and
 	true is a synonym for 20.
+
+merge.suppressDest::
+	By adding a glob that matches the names of integration
+	branches to this multi-valued configuration variable, the
+	default merge message computed for merges into these
+	integration branches will omit "into <branch name>" from
+	its title.
++
+An element with an empty value can be used to clear the list
+of globs accumulated from previous configuration entries.
+When there is no `merge.suppressDest` variable defined, the
+default value of `master` is used for backward compatibility.