Update Icon to 9.4.3

Notable changes in version 9.4.3:

The system-specific Icon configurations have been reorganized and renamed.
The several BSD configurations have been merged into one.

The macintosh configuration now supports the loadfunc function.

A new porting guide has been written, and a new posix configuration
has been added as a starting point in constructing new ports.

The core library files remain stable. Notable changes include:
- procs/dijkstra          new procedures implement Dijkstra's control structures
- procs/html              add procedure for canonicalization of paths
- procs/matrix2           new procedures for matrix manipulation
- procs/nestlist          new procedures for representing nested lists as strings
- procs/printf            add %e format and fix a rounding problem
- progs/noise             new program for producing a random bitstream
- progs/unclog            improve logic for combining adjacent entries
- gprogs/dlgvu            improve coverage map; allow altitude in GPS data
- gprogs/gallery          faster thumbnail loading for JPEG images
- gprogs/img              many new features
- gprogs/sier             better color choices
- gprogs/trkvu            accept GPS track logs with altitude as the last field

The undocumented save function, which only worked on a few platforms, has been removed.


Approved by <tnn>.

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