Log Message:
emacs26: update to 26.2.

Emacs 26.2 has a wide variety of new features, including:

    Emacs modules can now be built outside of the Emacs tree source.
    Emacs is now compliant with the latest version 11.0 of the Unicode Standard.
    In Dired, the 'Z' command on a directory name compresses all of its files.