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

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

third_party/git/t/t6132-pathspec-exclude.sh

@@ -211,4 +211,37 @@ test_expect_success 't_e_i() exclude case #8' '
 	)
 '
 
+test_expect_success 'grep --untracked PATTERN' '
+	# This test is not an actual test of exclude patterns, rather it
+	# is here solely to ensure that if any tests are inserted, deleted, or
+	# changed above, that we still have untracked files with the expected
+	# contents for the NEXT two tests.
+	cat <<-\EOF >expect-grep &&
+	actual
+	expect
+	sub/actual
+	sub/expect
+	EOF
+	git grep -l --untracked file -- >actual-grep &&
+	test_cmp expect-grep actual-grep
+'
+
+test_expect_success 'grep --untracked PATTERN :(exclude)DIR' '
+	cat <<-\EOF >expect-grep &&
+	actual
+	expect
+	EOF
+	git grep -l --untracked file -- ":(exclude)sub" >actual-grep &&
+	test_cmp expect-grep actual-grep
+'
+
+test_expect_success 'grep --untracked PATTERN :(exclude)*FILE' '
+	cat <<-\EOF >expect-grep &&
+	actual
+	sub/actual
+	EOF
+	git grep -l --untracked file -- ":(exclude)*expect" >actual-grep &&
+	test_cmp expect-grep actual-grep
+'
+
 test_done