Adjust Tcl-related code to compile cleanly with Tcl 8.4 (add const modifiers as

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 699782b69518e18c20211df315c49b8cd0dc9345
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2002-12-30T22:10:54Z
Releases: 7.4.1
Adjust Tcl-related code to compile cleanly with Tcl 8.4 (add const modifiers as
needed).  Some desultory const-ification of SPI interface to support this.

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