FIX #697 in 2.9dev (bash hiccup @ tolower)

testssl.sh

@@ -1142,12 +1142,12 @@ html_footer() {
 
 ###### START helper function definitions ######
 
-if [[ $(uname) == "Linux" ]] ; then
-     toupper() { echo -n "${1^^}" ;  }
-     tolower() { echo -n "${1,,}" ;  }
-else
+toupper() { echo -n "${1^^}" ;  }
+tolower() { echo -n "${1,,}" ;  }
+if ! toupper aaa 2>/dev/null; then
+     # Older bash can't do this (MacOS X), even SLES 11, see #697
      toupper() { tr 'a-z' 'A-Z' <<< "$1"; }
-     tolower() { tr 'A-Z' 'a-z'  <<< "$1"; }
+     tolower() { tr 'A-Z' 'a-z' <<< "$1"; }
 fi
 
 debugme() {