Merge pull request tesseract-ocr#389 from vidiecan/issue_388

fixes tesseract-ocr#388 by using raw bytes utf8 encoding

Author: zdenop

training/stringrenderer.cpp

@@ -52,7 +52,7 @@ static const int kDefaultOutputResolution = 300;
 // Word joiner (U+2060) inserted after letters in ngram mode, as per
 // recommendation in http://unicode.org/reports/tr14/ to avoid line-breaks at
 // hyphens and other non-alpha characters.
-static const char* kWordJoinerUTF8 = "\u2060";
+static const char* kWordJoinerUTF8 = "\xE2\x81\xA0"; //u8"\u2060";
 static const char32 kWordJoiner = 0x2060;
 
 static bool IsCombiner(int ch) {