Run CI build against Tcl 9.0. Stop all support for Tcl 8.5

Author: jan.nijtmans

.github/workflows/linux-build.yml

@@ -7,7 +7,7 @@ defaults:
     shell: bash
 jobs:
   build:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     strategy:
       matrix:
         compiler:
@@ -25,9 +25,9 @@ jobs:
           path: tclconfig
       - name: Setup Environment (compiler=${{ matrix.compiler }})
         run: |
-          sudo apt-get install tcl8.6-dev libgdbm-dev liblmdb-dev
+          sudo apt-get install tcl9.0-dev libgdbm-dev liblmdb-dev
           mkdir "$HOME/install dir"
-          echo "CFGOPT=--with-tcl=/usr/lib/tcl8.6 --with-gdbm --with-lmdb" >> $GITHUB_ENV
+          echo "CFGOPT=--with-tcl=/usr/lib/tcl9.0 --with-gdbm --with-lmdb" >> $GITHUB_ENV
           echo "CC=$COMPILER" >> $GITHUB_ENV
         env:
           COMPILER: ${{ matrix.compiler }}

configure

@@ -2905,15 +2905,12 @@ printf '%s\n' "$as_me: WARNING: --with-tcl argument should refer to directory co
 			`ls -d /usr/lib/tcl9.1 2>/dev/null` \
 			`ls -d /usr/lib/tcl9.0 2>/dev/null` \
 			`ls -d /usr/lib/tcl8.6 2>/dev/null` \
-			`ls -d /usr/lib/tcl8.5 2>/dev/null` \
 			`ls -d /usr/local/lib/tcl9.1 2>/dev/null` \
 			`ls -d /usr/local/lib/tcl9.0 2>/dev/null` \
 			`ls -d /usr/local/lib/tcl8.6 2>/dev/null` \
-			`ls -d /usr/local/lib/tcl8.5 2>/dev/null` \
 			`ls -d /usr/local/lib/tcl/tcl9.1 2>/dev/null` \
 			`ls -d /usr/local/lib/tcl/tcl9.0 2>/dev/null` \
 			`ls -d /usr/local/lib/tcl/tcl8.6 2>/dev/null` \
-			`ls -d /usr/local/lib/tcl/tcl8.5 2>/dev/null` \
 			; do
 		    if test -f "$i/tclConfig.sh" ; then
 			ac_cv_c_tclconfig="`(cd $i; pwd)`"

tcl/cmdsrv/cmdsrv.tcl

@@ -27,7 +27,7 @@
 # redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 # -----------------------------------------------------------------------------
 
-package require Tcl    8.5-
+package require Tcl    8.6-
 package require thread 2.9-
 
 namespace eval cmdsrv {

tcl/phttpd/phttpd.tcl

@@ -32,7 +32,7 @@
 # redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 # -----------------------------------------------------------------------------
 
-package require Tcl    8.5-
+package require Tcl    8.6-
 package require thread 2.9-
 
 #