Add regex to detect the empty line that end the variable list.

Some variable names in 5.1 is soo long that there is no space inbetween 
name and value. Outputing a warning about it, as that should probably be fixed.
At least one space should be put between the name and value.

mysql-test/mysql-test-run.pl

@@ -1189,9 +1189,19 @@ sub check_mysqld_features () {
 	}
 	else
 	{
-	  # The variable list is ended with a blank line, so when a line
-	  # doesn't match the above regex, break the loop
-	  last;
+	  # The variable list is ended with a blank line
+	  if ( $line =~ /^[\s]*$/ )
+	  {
+	    last;
+	  }
+	  else
+	  {
+	    # Send out a warning, we should fix the variables that has no
+	    # space between variable name and it's value
+	    # or should it be fixed width column parsing? It does not
+	    # look like that in function my_print_variables in my_getopt.c
+	    mtr_warning("Could not parse variable list line : $line");
+	  }
 	}
       }
     }