hush: fix raw ^C handlisg in single-quoted strings

function                                             old     new   delta
parse_stream                                        2719    2754     +35

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/ash_test/ash-misc/control_char1.right

@@ -1,2 +1,3 @@
 
+b#c
 Done:0

shell/ash_test/ash-misc/control_char1.tests

@@ -1,2 +1,3 @@
 echo 
+echo 'b#c'
 echo Done:$?

shell/ash_test/ash-misc/for_with_bslashes.right

@@ -5,4 +5,5 @@ b"c
 b'c
 b$c
 b`true`c
+b#c
 Zero:0

shell/ash_test/ash-misc/for_with_bslashes.tests

@@ -1,9 +1,5 @@
-# UNFIXED BUG.
-# commented-out words contain ^C character.
-# It's a SPECIAL_VAR_SYMBOL, for now hush does not escape it.
-# When it is fixed, update this test.
-
-for a in 'a' 'b\c' 'b\\c' 'b"c' "b'c" 'b$c' 'b`true`c' ### 'b#c'
+# last word contains ^C character.
+for a in 'a' 'b\c' 'b\\c' 'b"c' "b'c" 'b$c' 'b`true`c' 'b#c'
 do
     echo $a
 done