netifd: update to latest git HEAD

f6fb700 interface-ip: fine tune IPv6 mtu warning
975a5c4 interface: tidy ipv6 mtu warning

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

package/network/config/netifd/Makefile

@@ -5,9 +5,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/netifd.git
-PKG_SOURCE_DATE:=2019-04-15
-PKG_SOURCE_VERSION:=666c14f95d372d8ccee39049e65caa49368aec09
-PKG_MIRROR_HASH:=c075d163bae475022523229997564850e449963940e4fcf196215a1ae85fbd0f
+PKG_SOURCE_DATE:=2019-05-08
+PKG_SOURCE_VERSION:=f6fb70005a52bb6bd6affd0fdc664664339a616b
+PKG_MIRROR_HASH:=283e38af9178bfccc56dad9138dad1ee189ff3dbbfd1d527d087d39a0b45ca67
 PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>
 
 PKG_LICENSE:=GPL-2.0