Allow tcllib's configure to run without tclsh. Remember to update the
version numbers to match support/installation/version.tcl when updating
tclllib.

--- tcllib-1.21/configure.orig	2022-09-07 22:20:50.000000000 +1000
+++ tcllib-1.21/configure	2022-09-08 01:07:43.000000000 +1000
@@ -1301,9 +1301,7 @@
 	echo "$as_me:$LINENO: result: $TCLSH_PROG" >&5
 echo "${ECHO_T}$TCLSH_PROG" >&6
     else
-	{ { echo "$as_me:$LINENO: error: No tclsh found in PATH:  $search_path" >&5
-echo "$as_me: error: No tclsh found in PATH:  $search_path" >&2;}
-   { (exit 1); exit 1; }; }
+	TCLSH_PROG=tclsh
     fi
 
 
@@ -1314,9 +1312,9 @@
 
 SAK=`$CYGPATH ${srcdir}/sak.tcl`
 
-PACKAGE=`$TCLSH_PROG "${SAK}" name`
-MAJOR_VERSION=`$TCLSH_PROG "${SAK}" major`
-MINOR_VERSION=`$TCLSH_PROG "${SAK}" minor`
+PACKAGE=tcllib
+MAJOR_VERSION=1
+MINOR_VERSION=21
 PATCHLEVEL=""
 
 VERSION=${MAJOR_VERSION}.${MINOR_VERSION}${PATCHLEVEL}