boost/libxslt: Enable nativesdk to unbreak <bitbake universe>
When run <make universe.fetchall>, the make will be broken because
nativesdk-boost and nativesdk-libxslt don't exist.
nativesdk-boost is depended by nativesdk-curlpp.
nativesdk-libxslt is depended by nativesdk-python-lxml.
In condition that meta-openembedded is compiled in.
Add nativesdk building for boost and libxslt.
Signed-off-by: Li Zhou <li.zhou@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
