tcl: fix path in Config.sh for sstate

We need fix the path in tclConfig.sh, tdbcConfig.sh and itclConfig.sh
for sstate, otherwise there would be build failures when use the sstate
across different builds.

e.g., when building expect:
[snip]
tmp/sysroots/qemuarma9/usr/include/tcl8.6
checking for Tcl private include files... configure: error: Cannot find private header tclInt.h in
/path/to/another/build/tmp/sysroots/qemuarma9/usr/include/tcl8.6.1
Configure failed.
[snip]

[YOCTO #6035]

(From OE-Core rev: cd83e4a30311e4399c6c634fe06ec835a95a1c17)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/tcltk/tcl_8.6.1.bb

@@ -90,3 +90,6 @@ do_install_ptest() {
 	cp -r ${S}/../library ${D}${PTEST_PATH}
 	cp -r ${S}/../tests ${D}${PTEST_PATH}
 }
+
+# Fix the path in sstate
+SSTATE_SCAN_FILES += "*Config.sh"