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/contrib/mw-to-git/t/test.config

@@ -3,15 +3,11 @@ WIKI_DIR_NAME=wiki
 
 # Login and password of the wiki's admin
 WIKI_ADMIN=WikiAdmin
-WIKI_PASSW=AdminPass
+WIKI_PASSW=AdminPass1
 
 # Address of the web server
 SERVER_ADDR=localhost
 
-# SQLite database of the wiki, named DB_FILE, is located in TMP
-TMP=/tmp
-DB_FILE=wikidb.sqlite
-
 # If LIGHTTPD is not set to true, the script will use the default
 # web server running in WIKI_DIR_INST.
 WIKI_DIR_INST=/var/www
@@ -28,10 +24,17 @@ WEB=WEB
 WEB_TMP=$WEB/tmp
 WEB_WWW=$WEB/www
 
+# Where our configuration for the wiki is located
+FILES_FOLDER=mediawiki
+FILES_FOLDER_DOWNLOAD=$FILES_FOLDER/download
+FILES_FOLDER_DB=$FILES_FOLDER/db
+FILES_FOLDER_POST_INSTALL_DB=$FILES_FOLDER/post-install-db
+
 # The variables below are used by the script to install a wiki.
 # You should not modify these unless you are modifying the script itself.
-# tested versions: 1.19.X -> 1.21.1
-MW_VERSION_MAJOR=1.21
-MW_VERSION_MINOR=1
-FILES_FOLDER=install-wiki
-DB_INSTALL_SCRIPT=db_install.php
+# tested versions: 1.19.X -> 1.21.1 -> 1.34.2
+#
+# See https://www.mediawiki.org/wiki/Download for what the latest
+# version is.
+MW_VERSION_MAJOR=1.34
+MW_VERSION_MINOR=2