display-alert: strip newlines as well as ANSI colors if ANSI_COLOR=none

- `ANSI_COLOR=none` is used when we're driving compile.sh from Python
- some debugging messages had newlines in them, thus making Python mark those as `[LEAKED]`

lib/functions/logging/display-alert.sh

@@ -15,7 +15,8 @@ function display_alert() {
 		if [[ "${POOR_MAN_PROFILER}" == "yes" ]]; then
 			poor_man_profiler
 		fi
-		echo -e "${extra_profiler}${3}::${1} ${2}" | sed 's/\x1b\[[0-9;]*m//g' >&2
+		echo -e "${extra_profiler}${3}::${1} ${2}" | sed 's/\x1b\[[0-9;]*m//g' | sed -z 's|\n|\\n|g' >&2 # remove ANSI colors and newlines
+		echo "" >&2                                                                                       # newline
 		return 0
 	fi