Update to 0.22.4:

Release 0.22.4
        core:
        * Always consider a softmask transfer function (Bug #63587)
        * Fix crash on malformed files (Bug #63190)
        * Splash: Fix compilation with fixed point mode enabled

        utils:
        * Fix crash on some files (Bug #63909)

        qt4:
        * Fix name decoding of some attachments (KDE Bug #307786)

        build system:
        * Fix compilation with mingw-w64 compiler

(wiz)