tests: strip the run-all tally with a portable escape

run-all extracts each suite's tally after stripping ANSI with a sed
`\x1b` escape, which only GNU sed interprets; on any other sed the
escape stays literal and the tally fails to parse. Match a literal ESC
built with printf, as the surrounding color variables already are, so
the strip works on any sed.

Author: bcoles

tests/run-all

@@ -47,10 +47,12 @@ for s in $SUITES; do
   "$b" 2>"$tmp"
   rc=$?
   cat "$tmp" >&2
-  # ANSI may bracket the tally; strip before extracting.
+  # ANSI may bracket the tally; strip before extracting. Match a literal ESC
+  # (printf, as the color vars above do) rather than a GNU-sed \x1b escape, so
+  # the strip works on any sed.
   line_plain=$(grep -E '[0-9]+/[0-9]+ tests passed' "$tmp" \
                | tail -1 \
-               | sed 's/\x1b\[[0-9;]*m//g')
+               | sed "s/$(printf '\033')\[[0-9;]*m//g")
   pass=$(printf '%s' "$line_plain" | awk '{ split($1, a, "/"); print a[1] }')
   count=$(printf '%s' "$line_plain" | awk '{ split($1, a, "/"); print a[2] }')
   rm -f "$tmp"