libxcb: Fix install file owner/group

The makefile uses cp -P behind the scenes for installing the tutorial files
and this preserves the build user identity. Fix this to the correct
owner/group. Usually do_package fixes and hides this but it can be seen
in do_install.

(From OE-Core rev: 34ef5c2a8d77fcb4a51c875a443f7b97b409586e)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/xorg-lib/libxcb_1.14.bb

@@ -30,6 +30,10 @@ REQUIRED_DISTRO_FEATURES = "x11"
 
 export PYTHON = "python3"
 
+do_install_append () {
+	chown root.root ${D}${datadir}/doc/${BPN}/tutorial -R
+}
+
 python populate_packages_prepend () {
     do_split_packages(d, '${libdir}', r'^libxcb-(.*)\.so\..*$', 'libxcb-%s', 'XCB library module for %s', allow_links=True)
 }