v4.7.2 - updated build for Linux x86-64. Added support for newer assignment.

Thanks to @SamSandq for pointing out that LST did not support the newer form of assignment used in many more modern Smalltalks. LST now supports the old '<-' and the newer ':=' forms.

This also fixes problems building under Linux where the linker warns about duplicate symbols.

v4.7.1 - Initial macOS port and image fixes

This release runs on macOS on ARM64 (M1/Apple Silicon) using Apple's compiler that comes with XCode. It also includes some tweaks to make sure that the image writing process does not attempt to write a value that is too large. There was an error in the code that write values that needed 8 bytes to represent. That does not work so well on 32-bit platforms.

This is lightly tested on macOS ARM64 and Debian Linux on MIPS32 (big endian).

There are pre-built binary images in the ./bin directory. I built those on Mac and tested them on Debian MIPS.