expExpressionConf, expValue: isspace cannot take a char argument.
mta_sendmail: isspace cannot take a char argument
Merge branch 'V5-4-patches' into V5-5-patches

* V5-4-patches:
  mta_sendmail: isspace cannot take a char argument
  expExpressionConf, expValue: isspace cannot take a char argument.
swrun_*: snprint may have set a too long string length. Fix it if needed.