const_cast: convert some C-style casts and remove some redundant ones

Change-Id: I7b184414d822e7d3f4f7694dcea540d731f970d9

i18npool/source/collator/collatorImpl.cxx

@@ -52,8 +52,8 @@ CollatorImpl::compareSubstring( const OUString& str1, sal_Int32 off1, sal_Int32
     if (cachedItem)
         return cachedItem->xC->compareSubstring(str1, off1, len1, str2, off2, len2);
 
-    sal_Unicode *unistr1 = (sal_Unicode*) str1.getStr() + off1;
-    sal_Unicode *unistr2 = (sal_Unicode*) str2.getStr() + off2;
+    sal_Unicode *unistr1 = const_cast<sal_Unicode*>(str1.getStr()) + off1;
+    sal_Unicode *unistr2 = const_cast<sal_Unicode*>(str2.getStr()) + off2;
     for (int i = 0; i < len1 && i < len2; i++)
         if (unistr1[i] != unistr2[i])
             return unistr1[i] < unistr2[i] ? -1 : 1;

i18npool/source/inputchecker/inputsequencechecker.cxx

@@ -95,10 +95,10 @@ InputSequenceCheckerImpl::getLanguageByScripType(sal_Unicode cChar, sal_Unicode
     if (type != UnicodeScript_kScriptCount &&
             type == unicode::getUnicodeScriptType( nChar, typeList, UnicodeScript_kScriptCount )) {
         switch(type) {
-            case UnicodeScript_kThai:           return (sal_Char*)"th";
+            case UnicodeScript_kThai:           return const_cast<sal_Char*>("th");
                                                 //case UnicodeScript_kArabic:       return (sal_Char*)"ar";
                                                 //case UnicodeScript_kHebrew:       return (sal_Char*)"he";
-            case UnicodeScript_kDevanagari:   return (sal_Char*)"hi";
+            case UnicodeScript_kDevanagari:   return const_cast<sal_Char*>("hi");
         }
     }
     return NULL;

i18npool/source/transliteration/transliteration_caseignore.cxx

@@ -121,8 +121,8 @@ Transliteration_caseignore::compare(
     const OUString& str2, sal_Int32 pos2, sal_Int32 nCount2, sal_Int32& nMatch2)
     throw(RuntimeException)
 {
-    const sal_Unicode *unistr1 = (sal_Unicode*) str1.getStr() + pos1;
-    const sal_Unicode *unistr2 = (sal_Unicode*) str2.getStr() + pos2;
+    const sal_Unicode *unistr1 = const_cast<sal_Unicode*>(str1.getStr()) + pos1;
+    const sal_Unicode *unistr2 = const_cast<sal_Unicode*>(str2.getStr()) + pos2;
     sal_Unicode c1, c2;
     MappingElement e1, e2;
     nMatch1 = nMatch2 = 0;