modules: update OpenWrt base

15ce616c2de7 build: add PKG_SOURCE_URL_FILE support
436dbf12aa73 kernel: nf_conntrack_rtcache: fix cleanup on netns delete and rmmod
b177b180bbdb mac80211: add default value for noscan
e68d589e7b8c e2fsprogs: Fix CVE-2019-5094 in libsupport

modules

@@ -2,7 +2,7 @@ GLUON_FEEDS='packages routing luci gluon'
 
 OPENWRT_REPO=https://git.openwrt.org/openwrt/openwrt.git
 OPENWRT_BRANCH=openwrt-19.07
-OPENWRT_COMMIT=6160f773fef2e204065a398abdd1504913a1bf8e
+OPENWRT_COMMIT=15ce616c2de797259cc125f1ece5f2358ea4bd5a
 
 PACKAGES_PACKAGES_REPO=https://github.com/openwrt/packages.git
 PACKAGES_PACKAGES_BRANCH=openwrt-19.07