tcl8: re-add tcl 8 to support building expect

I'd be happy to remove expect from core as it has been unmaintained for years,
but sadly gcc/binutils test suites are basically written in it (via dejagnu),
and ltp makes use of it as well.

I attempted porting expect to tcl 9, but it's a tcl extension and makes
extensive use of features that have been deprecated in tcl 8 and removed
in tcl 9, and even pokes into tcl internals.

At some point hopefully the GNU toolchain upstreams are going to notice;
for now we'll carry tcl (latest) and tcl8 recipes.

tcl and tcl8 packages can be co-installed, the latter is adjusted
to contain tclsh8.

tcl-dev and tcl8-dev packages can also be co-installed, a few files
in tcl8-dev are renamed to avoid clashes with tcl-dev (tcl.pc -> tcl8.pc,
and similar for tclConfig.sh and tclooConfig.sh).

(From OE-Core rev: 8ec7bfc6644aff011545dfb0f5a415e79d7b0844)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/tcltk8/tcl8/run-ptest

@@ -0,0 +1,31 @@
+#!/bin/sh
+
+# clock.test needs a timezone to be set
+export TZ="Europe/London"
+export TCL_LIBRARY=library
+export ERROR_ON_FAILURES=1
+
+# Some tests are overly strict with timings and fail on loaded systems.
+SKIP=""
+# 15321
+SKIP="$SKIP async-\* event-\*"
+# 14882
+SKIP="$SKIP cmdMZ-6.6"
+# 15081
+SKIP="$SKIP exit-1.\*"
+# 15407 15421
+SKIP="$SKIP \*io-46.1"
+# io-13.6 explicitly says it can fail on slow/loaded machines
+SKIP="$SKIP io-13.6"
+# 14825
+SKIP="$SKIP socket-\* socket_inet-\*"
+
+for i in tests/*.test; do
+    i=$(basename $i)
+    ./tcltest tests/all.tcl -file $i -skip "$SKIP"
+    if [ $? -eq 0 ]; then
+        echo "PASS: $i"
+    else
+        echo "FAIL: $i"
+    fi
+done