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/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