emulators/hercules4sdl: update to 4.7.

Changes from https://sdl-hercules-390.github.io/html/hercnew.html:

 * Fix EX/EXRL instructions to not cause spurious PIC 3 (Tony Harminc, Fish)
#415
 * Fix E7 Prefix CCW support (Aaron Finerman, Fish)
 * Fix Read Count Suffix bug causing data corruption #575
 * Fix Locate Record Write Track Operation (Aaron Finerman, Fish) #601
 * Fix Read Tracks CCW when chained from Prefix (Aaron Finerman, Fish) #603
 * Fix various ICKDSF-related CCW handling bugs (Anders Edlund, Fish) #615
 * Fix 3705 crash on attach/detach/attach (Jay Maynard)
 * Fix usleep/nanosleep excessive host CPU consumption (Peter Jansen, Fish) #589
 * Fix '--version' and '--usage' switches (Bill Lewis)
 * Fix TDF file emulated tape open bug (Fish)
 * Fix maketape utility to not pad binary files (Fish)
 * Fix Date/time parsing issue in runtest/make-check (Peter Jansen)
 * Fix dasdseq utility Large/Extended dataset truncation (Gregory, Fish) #602
 * Fix Multi-device statement failure handling (Fish) #604
 * Fix Hang during device detach (Fish)
 * Fix Incorrect thread priority handling (Tyler Mitchell)
 * Fix Occasional crash on exit (Tyler Mitchell)
 * Fix Confusing/unclear shadow file messages (Fish) #616
 * Fix cckdmap utility non-33xx dasd-type bug (Fish)
 * Fix Shared devices 10-second-delay bug (Fish) #624
 * Fix 'ENGINES' command bug (Fish) #626
 * Fix Shutdown/exit logging (James Wekel) #480, #634
 * Fix Possible crash at CCKD dasd termination (Fish)
 * Fix Inaccurate "Running on:" Windows name and version (Bill Lewis, Fish)

 * New: Improved CU12, CU14 instruction performance (James Wekel) #623
 * New: dasdls utility '-cchh' and '-nosort' options (Ian, Fish)
 * New: maketape utility meta-file 'BIN' keyword support (Fish)
 * New: dasdseq utility '-record' mode support (Gregory, Fish) #614
 * New: Ability to trace only specific CCW opcodes (Fish) #576
 * New: JSON support in HTTP server #578
 * New: README.DAEMON document
 * New: 'iconpfxs' command (Fish)
 * New: Support quoted strings in storage alteration commands (Fish)
 * New: Add timed statistics to instruction counting (Andrey) #588
 * New: dyngui LCSS devnum support (Fish)
 * New: Use performance cores on Apple Silicon (Enrico Sorichetti)
 * New: Support 'clang' builds under Windows MSVC (Peter Jansen) #629
 * New: Highlight 'S'evere and 'A'ction messages too (Fish)


(rhialto)