Add /msbasic.ihx.patch which comments out a particular call to direct console I/O...

Add /msbasic.ihx.patch which comments out a particular call to direct console I/O in order to defeat Ctrl-C checking (makes the new msbasic_test script work), also fix incorrect checksum error report in all emu_*.c for *.ihx, *.s19 (the new way prints what the last byte of the line should be, to aid manual patching)