Fix to allow single character here strings.

scsh/here.scm

@@ -94,7 +94,7 @@
     (cond ((eof-object? delim)
 	   (reading-error port
 			  "EOF while reading #<< here-string delimiter line."))
-	  ((= 1 (string-length delim))
+ 	  ((= 0 (string-length delim))
  	   (reading-error port "#<< here-string empty delimiter line"))
 
 	  (else