The BESM6 makefile build has always allowed a makefile argument FONTFILE=.
That option still exists and will change the default font file.
Also extend the default font file names to include one which is found on
NetBSD.
- Remove legacy support for SDL prior to SDL2
- Add support to dynamically locate a useful truetype font at panel startup
- Still support compile time provided font via FONTFILE
These changes facilitate more robust parameter type checking and helps
to identify unexpected coding errors.
Most simulators can now also be compiled with a C++ compiler without
warnings.
Additionally, these changes have also been configured to facilitate easier
backporting of simulator and device simulation modules to run under the
simh v3.9+ SCP framework.
Fix besm6_panel to use FONTFILE when building with SDL 1.2,
Fix besm6_panel compile issues on Windows
Provide FONTFILE name via either -DFONTFILE OR via a #define in a generated besm6_panel_font.h
