base-files: Remove localhost ::1 from hosts if ipv6 missing

If a distribution doesn't provide IPv6, the mapping of localhost and ::1 has
to be removed.

(From OE-Core rev: c3d9cff06f383528884bfb5c4f8a6a6cb023977a)

Signed-off-by: Jörg Sommer <joerg.sommer@navimatix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/base-files/base-files_3.0.14.bb

@@ -136,6 +136,10 @@ do_install () {
 		echo ${hostname} > ${D}${sysconfdir}/hostname
 		echo "127.0.1.1 ${hostname}" >> ${D}${sysconfdir}/hosts
 	fi
+
+	if ${@bb.utils.contains('DISTRO_FEATURES', 'ipv6', 'false', 'true', d)}; then
+		sed -i '/^::1/s/ localhost//' ${D}${sysconfdir}/hosts
+	fi
 }
 
 do_install:append:libc-glibc () {