[Tcsh] tcsh-6.24.08 and DragonFlyBSD 6.4.0

[Nelson H. F. Beebe]

Thanks for the suggestion to try this one-token tweak to the
tcsh-6.24.08 source code on DragonFlyBSD 6.4.0:

%  diff -c tc.alloc.c~ tc.alloc.c
*** tc.alloc.c~ Mon Apr 10 03:26:45 2023
--- tc.alloc.c  Tue Apr 11 10:39:05 2023
***************
*** 457,463 ****
  #ifdef __linux__
  #define M_U_S_CONST
  #else
! #define M_U_S_CONST
  #endif
  size_t malloc_usable_size(M_U_S_CONST void *);
  size_t
--- 457,463 ----
  #ifdef __linux__
  #define M_U_S_CONST
  #else
! #define M_U_S_CONST const
  #endif
  size_t malloc_usable_size(M_U_S_CONST void *);
  size_t

I have just done that on my DragonFlyBSD 6.4.0 system, and the build
was successful, and all tests passed!

## ------------- ##
## Test results. ##
## ------------- ##

195 tests were successful.
53 tests were skipped.

I'm going to install this build on that system.

-------------------------------------------------------------------------------
- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                                                          -
- Department of Mathematics, 110 LCB    Internet e-mail: beebe at math.utah.edu  -
- 155 S 1400 E RM 233                       beebe at acm.org  beebe at computer.org -
- Salt Lake City, UT 84112-0090, USA    URL: http://www.math.utah.edu/~beebe/ -
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