nativesdk-libtool: sanitize the script, remove buildpaths

nativesdk-libtool: sanitize the script, remove buildpaths

Use the same sed command to sanitize libtool script for target recipe
and nativesdk one. Otherwise fails with buildpaths QA error:

ERROR: nativesdk-libtool-2.5.0-r0 do_package_qa: QA Issue: File /usr/local/oe-sdk-hardcoded-buildpath/sysroots/x86_64-pokysdk-linux/usr/bin/libtool in package nativesdk-libtool contains reference to TMPDIR [buildpaths]

Signed-off-by: Denys Dmytriyenko <denys@konsulko.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>