I ran the command strings on libsec-ril.so and found these files as dependencies.
BLOB_ROOT="$LINEAGE_ROOT"/vendor/"$VENDOR"/"$DEVICE"/proprietary
patchelf --replace-needed libprotobuf-cpp-full.so libprotobuf-cpp-fl26.so $BLOB_ROOT/lib/libsec-ril.so
patchelf --replace-needed libprotobuf-cpp-full.so libprotobuf-cpp-fl26.so $BLOB_ROOT/lib/libsec-ril-dsds.so
+(perl -pi -e "s/\/system\/etc\/plmn_delta.bin/\/vendor\/etc\/plmn_delta.bin/g" $BLOB_ROOT/lib/libsec-ril.so)
+(perl -pi -e "s/\/system\/etc\/plmn_delta.bin/\/vendor\/etc\/plmn_delta.bin/g" $BLOB_ROOT/lib/libsec-ril-dsds.so)
+(perl -pi -e "s/\/system\/etc\/plmn_se13.bin/\/vendor\/etc\/plmn_se13.bin/g" $BLOB_ROOT/lib/libsec-ril.so)
+(perl -pi -e "s/\/system\/etc\/plmn_se13.bin/\/vendor\/etc\/plmn_se13.bin/g" $BLOB_ROOT/lib/libsec-ril-dsds.so)
"${MY_DIR}/setup-makefiles.sh"
vendor/firmware/setfile_5e3.bin
# RIL
+etc/plmn_delta.bin:vendor/etc/plmn_delta.bin
+etc/plmn_se13.bin:vendor/etc/plmn_se13.bin
lib/libsec-ril.so
lib/libsec-ril-dsds.so