FTP: improve character encoding detection in cases where ICU's first guess is wrong.

net/data/ftp/dir-listing-ls-20

Index: net/data/ftp/dir-listing-ls-20
diff --git a/net/data/ftp/dir-listing-ls-20 b/net/data/ftp/dir-listing-ls-20
new file mode 100644
index 0000000000000000000000000000000000000000..18d5bb27e51bdd2a0db2f2d576e625d6abf18c95
--- /dev/null
+++ b/net/data/ftp/dir-listing-ls-20
@@ -0,0 +1,18 @@
+drwxrwxr-x   17 ftp      ftp          4096 Nov 01 16:27 .
+drwxr-xr-x    7 ftp      ftp          4096 Apr 03  2010 ..
+drwxrwxrwx    5 ftp      ftp          4096 May 26 15:51 2012_-_2012-(2009)-[1080p]_[BD]
+-rw-rw-rw-    1 ftp      ftp          4931 Jun 08 15:24 _READ_ME.txt
+drwxrwxrwx    5 ftp      ftp          4096 Nov 01 16:27 Áåç_ëèöà_-_Face_Off-(1997)-[1080p]_[BD]
+drwxrwxrwx    4 ftp      ftp          4096 Jan 22  2010 Ââåðõ_-_Up-(2009)-[1080p]_[BD]
+drwxrwxrwx    5 ftp      ftp          4096 May 27 18:12 Âñïîìíèòü_âñå_-_Total_Recall-(1990)-[1080p]_[BD]
+drwxrwxrwx    3 ftp      ftp          4096 May 21 14:28 Çàêîíîïîñëóøíûé_ãðàæäàíèí_[Ðàñøèðåííàÿ_âåðñèÿ]_-_Law_Abiding_Citizen_[Unrated_Edition]-(2009)-[1080p]_[BD_Remux]
+drwxrwxrwx    5 ftp      ftp          4096 Jan 21  2010 Ìîíñòðî_-_Cloverfield-(2008)-[1080p]_[BD]
+drwxrwxrwx    4 ftp      ftp          4096 May 26 13:43 Ïàíäîðóì_-_Pandorum-(2009)-[1080p]_[BD]
+drwxrwxrwx    4 ftp      ftp          4096 May 27 14:18 Ïîñëåäíèé_ñàìóðàé_-_The_Last_Samurai-(2003)-[1080p]_[BD]
+drwxrwxrwx    6 ftp      ftp          4096 Jan 27  2010 Ðàéîí_9_-_District_9-(2009)-[1080p]_[BD]
+drwxrwxrwx    7 ftp      ftp          4096 Jan 01  2010 Ðîêêè_Àíòîëîãèÿ_-_Rocky_The_Undisputed_Collection-(1976_1979_1982_1985_1990)-[1080p]_[BD]
+drwxrwxrwx    4 ftp      ftp          4096 May 31 12:57 Ñóððîãàòû_-_Surrogates-(2009)-[1080p]_[BD]
+drwxrwxrwx    4 ftp      ftp          4096 Jan 28  2010 Òðîéíîé_Ôîðñàæ-Òîêèéñêèé_Äðèôò_-_The_Fast_and_the_Furious-Tokyo_Drift-(2006)-[1080p]_[BD]
+drwxrwxrwx    4 ftp      ftp          4096 Jan 08  2010 Ôîðñàæ_-_The_Fast_and_the_Furious-(2001)-[1080p]_[BD]
+drwxrwxrwx    4 ftp      ftp          4096 Jan 06  2010 Ôîðñàæ_2_-_2_Fast_2_Furious-(2003)-[1080p]_[BD]
+drwxrwxrwx    4 ftp      ftp          4096 Jun 08 15:26 Ôîðñàæ_4_-_Fast_&_Furious-(2009)-[1080p]_[BD]