Fix package lists generation

Signed-off-by: Michal Hrusecky <Michal@Hrusecky.net>

helpers/generate_userlists.sh

@@ -72,7 +72,7 @@ M4ARGS="--include=lists -D _INCLUDE_=lists/ -D _BRANCH_=$BRANCH -D _BOARD_=$BOAR
 $MINIMAL && M4ARGS="$M4ARGS -D _BRANCH_FALLBACK_=nightly"
 
 sed -i 's|subdirs = {"base"[}]*}|subdirs = {"core"'"$(
-	cat "$SRC_DIR"/feeds.conf | sed 's|#.*||' | sed 's|src-git \([^[:blank:]]*\) .*|, "\1"|'
+	cat "$SRC_DIR"/feeds.conf | sed 's|#.*||' | sed 's|src-git \([^[:blank:]]*\) .*|, "\1"|' | tr '\n' ' '
 )}|" "$SRD_DIR/lists/repository.m4"
 
 cd "$SRC_DIR"