tst_QTextScriptEngine fails on most of the platforms

./tst_qtextscriptengine 
********* Start testing of tst_QTextScriptEngine *********
Config: Using QTest library 4.8.2, Qt 4.8.2
PASS   : tst_QTextScriptEngine::initTestCase()
SKIP   : tst_QTextScriptEngine::devanagari() couln't find Raghindi
   Loc: [tst_qtextscriptengine.cpp(242)]
SKIP   : tst_QTextScriptEngine::bengali() couln't find Akaash
   Loc: [tst_qtextscriptengine.cpp(412)]
QDEBUG : tst_QTextScriptEngine::gurmukhi() Lohit Punjabi: shaping of string  a15  a4d  a39  failed, nglyphs=2, expected 2
QDEBUG : tst_QTextScriptEngine::gurmukhi()     glyph result =   3f   9c 
FAIL!  : tst_QTextScriptEngine::gurmukhi() 'shaping(f, s)' returned FALSE. ()
   Loc: [tst_qtextscriptengine.cpp(568)]
SKIP   : tst_QTextScriptEngine::oriya() couln't find utkal
   Loc: [tst_qtextscriptengine.cpp(609)]
SKIP   : tst_QTextScriptEngine::tamil() couln't find AkrutiTml1
   Loc: [tst_qtextscriptengine.cpp(686)]
SKIP   : tst_QTextScriptEngine::telugu() couln't find Pothana2000
   Loc: [tst_qtextscriptengine.cpp(734)]
SKIP   : tst_QTextScriptEngine::kannada() couln't find Sampige
   Loc: [tst_qtextscriptengine.cpp(781)]
SKIP   : tst_QTextScriptEngine::malayalam() couln't find AkrutiMal2
   Loc: [tst_qtextscriptengine.cpp(873)]
SKIP   : tst_QTextScriptEngine::sinhala() couln't find Malithi Web
   Loc: [tst_qtextscriptengine.cpp(939)]
SKIP   : tst_QTextScriptEngine::greek() couln't find SBL_grk
   Loc: [tst_qtextscriptengine.cpp(1120)]
PASS   : tst_QTextScriptEngine::khmer()
SKIP   : tst_QTextScriptEngine::linearB() couln't find Penuturesu
   Loc: [tst_qtextscriptengine.cpp(1010)]
PASS   : tst_QTextScriptEngine::controlInSyllable_qtbug14204()
PASS   : tst_QTextScriptEngine::combiningMarks_qtbug15675()
PASS   : tst_QTextScriptEngine::mirroredChars()
PASS   : tst_QTextScriptEngine::thaiIsolatedSaraAm()
PASS   : tst_QTextScriptEngine::thaiWithZWJ()
PASS   : tst_QTextScriptEngine::thaiLineSplitting()
FAIL!  : tst_QTextScriptEngine::thaiSaraAM() Compared values are not the same
   Actual (e->layoutData->items[0].num_glyphs): 29
   Expected (ushort(28)): 28
   Loc: [tst_qtextscriptengine.cpp(1349)]
PASS   : tst_QTextScriptEngine::thaiMultipleVowels()
PASS   : tst_QTextScriptEngine::cleanupTestCase()
Totals: 10 passed, 2 failed, 10 skipped
********* Finished testing of tst_QTextScriptEngine *********