Log Message:
Update cpmtools to cpmtools-2.23.

Changes since 2.22:

o  Use 16 bit block pointers for file systems > 256 blocks, not >= 256
o  Translate CP/M file name character '/' to ',' for the host and back
o  dirblks in Kaypro format fixed
o  Misc fixes for directory listing
o  Added bootsec diskdefs option
o  Check Device_close return value
o  Check for too small block number when reading file data
o  Replaced obsolete macros in configure.in
o  Cygwin/Windows support did not build any more and likely not for quite
   some time, so it was removed.

(We're coming from 2.13, so there's quite a few more since then.)