[Fractint] Update 12-26 to SDL version

Folks, Fixed image browser crashes. Fixed windows version use of long double.  There is still a problem with input/output of the long double type, but the ML219-X3.GIF image should generate correctly now. Windows version (32-bit) is: https://fractint.net/ftp/experimental/SDL2-fractint-20.05alpha-2017-12- 26.zip Pre-compiled 64-bit Linux version is: http://www.fractint.net/ftp/experimental/SDL2-Xfractint-20.05alpha-2017 -12-26.tar.gz or look in the directory: https://fractint.net/ftp/experimental/ Jonathan