shadow: don't install libattr.so.* when xattr not in DISTRO_FEATURES

Fixes the following issue:

install: cannot stat '.../recipe-sysroot-native/usr/lib/libattr.so.*': No such file or directory
...
ERROR: Task (virtual:native:.../shadow_4.14.2.bb:do_install) failed with exit code '1'

(From OE-Core rev: b3afb80d07d97aaa786b6921fb6f61e316201367)

Signed-off-by: Sam Van Den Berge <sam.van.den.berge@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/shadow/shadow.inc

@@ -160,7 +160,8 @@ do_install:append:class-native() {
         binaries=$(find ${D}${base_bindir}/ ${D}${base_sbindir}/ ${D}${bindir}/ ${D}${sbindir}/ -executable -type f)
         chrpath -k -r ${STAGING_DIR_NATIVE}/lib-shadow-deps $binaries
         mkdir -p ${D}${STAGING_DIR_NATIVE}/lib-shadow-deps/
-        install ${STAGING_LIBDIR_NATIVE}/libattr.so.* ${STAGING_LIBDIR_NATIVE}/libbsd.so.* ${STAGING_LIBDIR_NATIVE}/libmd.so.* ${D}${STAGING_DIR_NATIVE}/lib-shadow-deps/
+        libattr=${@bb.utils.contains('DISTRO_FEATURES', 'xattr', "${STAGING_LIBDIR_NATIVE}/libattr.so.*", '', d)}
+        install $libattr ${STAGING_LIBDIR_NATIVE}/libbsd.so.* ${STAGING_LIBDIR_NATIVE}/libmd.so.* ${D}${STAGING_DIR_NATIVE}/lib-shadow-deps/
         install ${D}${libdir}/*.so.* ${D}${STAGING_DIR_NATIVE}/lib-shadow-deps/
 }