Start building libnetconf2-cpp

It is not used anywhere yet, but it's available to the CI, and it's
getting built.

Change-Id: I6c718b0ec5931bac5668ebc1abbea45fe27898d0
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/dependencies/+/5432
diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index 152f0b6..bf1abe4 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -51,6 +51,7 @@
 BR2_PACKAGE_UBOOT_TOOLS_KWBOOT=y
 BR2_PACKAGE_CA_CERTIFICATES=y
 BR2_PACKAGE_LIBGPIOD_TOOLS=y
+BR2_PACKAGE_LIBNETCONF2_CPP=y
 BR2_PACKAGE_NETOPEER2=y
 BR2_PACKAGE_NETOPEER2_CLI=y
 BR2_PACKAGE_ELFUTILS=y
diff --git a/dev-setup-git.sh b/dev-setup-git.sh
index cc76c80..7fe7bcb 100755
--- a/dev-setup-git.sh
+++ b/dev-setup-git.sh
@@ -19,6 +19,7 @@
 SYSREPO_CPP_OVERRIDE_SRCDIR = ${CZECHLIGHT_BR2_EXT_LOC}/submodules/dependencies/sysrepo-cpp
 HOST_SYSREPO_POST_RSYNC_HOOKS += HOST_SYSREPO_PATCH_USE_FAKE_DEV_SHM
 LIBNETCONF2_OVERRIDE_SRCDIR = ${CZECHLIGHT_BR2_EXT_LOC}/submodules/dependencies/libnetconf2
+LIBNETCONF2_CPP_OVERRIDE_SRCDIR = ${CZECHLIGHT_BR2_EXT_LOC}/submodules/dependencies/libnetconf2-cpp
 NETOPEER2_OVERRIDE_SRCDIR = ${CZECHLIGHT_BR2_EXT_LOC}/submodules/dependencies/Netopeer2
 
 CLA_SYSREPO_OVERRIDE_SRCDIR = ${CZECHLIGHT_BR2_EXT_LOC}/submodules/cla-sysrepo
diff --git a/submodules/buildroot b/submodules/buildroot
index 402ee09..d0ec94c 160000
--- a/submodules/buildroot
+++ b/submodules/buildroot
@@ -1 +1 @@
-Subproject commit 402ee098bb7c8ba624c6cad00a035e3a3ef33839
+Subproject commit d0ec94c54354dcdf73d9df5fa72dc2a76cda40da
diff --git a/submodules/dependencies b/submodules/dependencies
index bb89474..474bef9 160000
--- a/submodules/dependencies
+++ b/submodules/dependencies
@@ -1 +1 @@
-Subproject commit bb89474e04ffa49c15e22e4f1239f93a8ea71739
+Subproject commit 474bef95c5fb4ad5d6b2df1bd8f1b4e9fe19c94d