Log Message:
news/pan: update to 0.149.

Switched the build to gtk3.

December 22, 2021 - Pan 0.149 "Bellevue"

    Fix freeze when loading group with non-ascii characters in subject
    Avoid mojibake in Subject and Headers
    Fix x-face folding
    Add Base64-encoded Face header

October 24, 2021 - Pan 0.148 "Chamechaude"

    GMime 3 is used by default (the configure option --with-gmime30 is gone)
    GMime 2 is deprecated, but can be used with the configure.ac option --with-gmime2
    fixed missing buttons in the Post widget
    the preference widget is no longer oversized
    release tag format has changed