classes/populate_sdk_ext: reset TCLIBCAPPEND to get consistent TMPDIR
populate_sdk_ext sets TMPDIR to a known static value with '/tmp' directory
name and that name is hard coded in a few places (e.g., in
meta-environment-extsdk.bb that writes the eSDK environment variables).
Distros that do not reset TCLIBCAPPEND (poky does) end up getting
TMPDIR = /tmp-${TCLIBCAPPEND} via defaultsetup.conf and that breaks
the functionality in eSDK that expects everything is in /tmp.
To get TMPDIR consistent, we also need to reset TCLIBCAPPEND in
populate_sdk_ext.bbclass.
Fixes: [YOCTO #11298] Signed-off-by: Mikko Ylinen <mikko.ylinen@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
