Log Message:
Updated xkeyboard-config to 2.20.

Emil Velikov (1):
      autogen.sh: use quoted string variables

Michal Suchanek (1):
      ctrl: add missing modifier_map

Mihail Konev (1):
      autogen: add default patch prefix

Peter Hutterer (3):
      Drop AM_MAINTAINER_MODE
      autogen.sh: honor NOCONFIGURE=1
      autogen.sh: use exec instead of waiting for configure to finish

Sergey Udaltsov (13):
      Add missing Arabic diacritics to Arabic layouts
      Restored original RALT behavior for German
      Rulemak layout (Colemak based Russian phonetic layout)
      fixed credits
      Add Elfdalian layout
      Fixed al(plisi)
      Added ruble to rulemak
      Changed AltGr+t to Turkish Lira (instead of trademark)
      prerelease 2.19.99 for translations
      Added Lira to Turkish F layout as well
      Updated translations, prerelease
      Erroneous patch applied for modifiers
      Release 2.20

Stefan Tauner (2):
      symbols/de: use rightsinglequotemark on BKSL in all variants
      symbols/de: Fix whitespace after adding rightsinglequotemark