#105 CONST84 is deprecated, change to const

[Peter da Silva]

Expect 5.45.4 build against tcl 8.6.8 on Ubuntu/amd64 4.13.0-37-generic

exp_command.c contains one instance of CONST84. This is deprecated and should be replaced by const.

Build error:

exp_command.c: In function ‘Exp_ConfigureObjCmd’:
exp_command.c:2538:20: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘char’
     static CONST84 char* options [] = {
                    ^~~~

[Nils Carlson]

done. Thank you.