Log Message:
at-spi2-core: update to 2.26.2.

What's new in at-spi2-core 2.26.2:

* dist po/meson.build (bgo#789666).

* Generate correct sonname when building with meson.

What's new in at-spi2-core 2.26.1:

* Remove unused dependency on libxkbcommon.

* Various meson build fixes.

* Updated Dutch and Catalan translations.

What's new in at-spi2-core 2.25.92:

* configure.ac: make xkb optional, as intended.

* Optionally read the bus address from the ATSPI_BUS_ADDRESS environment
  variable (bgo#787126).