Log Message:
jimtcl: Update to 0.81.  Fix Darwin and SunOS.

This release contains bug fixes plus a number of additional features. A
summary is below. See git for the full changelog.

Thanks to everyone who contributed to this release.

Bugs fixed in version 0.81

 - info complete - return 0 if the script is missing an end quote
 - sqlite3 - return integers as 64 bit values, not 32 bit

Features and improvements added in version 0.81

 - New redis client extension
 - expr - TIP 582 - support comments in expressions
 - Many commands now accept “safe” integer expressions rather than simple
   integers: loop, range, incr, string repeat, lrepeat, pack, unpack, rand
 - string and list indexes now accept “safe” integer expressions
 - loop can now omit the start value
 - New xtrace command for execution trace support
 - Add history keep
 - Add support for lsearch -index and lsearch -stride, the latter per TIP 351
 - lsort -index now supports multiple indices
 - Add support for lsort -stride
 - open now supports POSIX-style access arguments
 - sdl extension now supports SDL2, and basic text support is added as well
   as polling support
 - ABI version checking is now available to allow dynamic modules to verify
   they are loaded into a compatible interpreter

Possible incompatibilities in version 0.81

 - If the --compat configure option is not set, expr now only allows a single
   argument (per TIP 526)