Log Message:
efax-gtk: Update to 3.2.15

Changelog:
Version 3.2.15 (3rd June 2020)
--------------

        Fix build for gcc-10 (efax/efaxlib.h, efax/efaxlib.c,
        efax/Makefile.am, efax/Makefile.in).

Version 3.2.14 (6th March 2020)
--------------

        Remove X11 specific code to allow the program to run better
        against wayland compositors (acinclude.m4, configure.ac;
        dialogs.cpp, helpfile.cpp, logger.cpp, main.cpp, mainwindow.cpp,
        prog_defs.h; src/Makefile.am).

        Fix label layout in settings dialog (settings.cpp).

        Apply SO_REUSEADDR option when constructing sockets
        (socket_server.cpp).

        Deal with strict aliasing warning (efax/efaxos.c).