Turn LanguageTag::ScriptType into scoped enum

...to avoid -Werror,-Wshadow from Clang trunk with
<https://reviews.llvm.org/D52400> "Improve -Wshadow warnings with enumerators",
warning about shadowing of UNKNOWN in e.g. enum ESCHER_BlibType in
include/filter/msfilter/escherex.hxx

Change-Id: Id6608474e76730be4c439f480c31f661b8b5748e
Reviewed-on: https://gerrit.libreoffice.org/62013
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

i18nlangtag/source/languagetag/languagetag.cxx

@@ -673,7 +673,7 @@ LanguageTag::ScriptType LanguageTag::getOnTheFlyScriptType( LanguageType nRegist
     if (itID != rMapLangID.end())
         return (*itID).second->getScriptType();
     else
-        return UNKNOWN;
+        return ScriptType::UNKNOWN;
 }
 
 

include/i18nlangtag/languagetag.hxx

@@ -62,7 +62,7 @@ public:
         These need to correspond to the ExtraLanguages.ScriptType template
         property in officecfg/registry/schema/org/openoffice/VCL.xcs
      */
-    enum ScriptType
+    enum class ScriptType
     {
         UNKNOWN = 0,
         WESTERN = 1,      // Copies css::i18n::ScriptType for strong types

svtools/source/misc/langtab.cxx

@@ -186,7 +186,7 @@ SvtLanguageTableImpl::SvtLanguageTableImpl()
         {
             LanguageTag aLang(rBcp47);
             LanguageType nLangType = aLang.getLanguageType();
-            if (nType <= LanguageTag::ScriptType::RTL && nType > LanguageTag::ScriptType::UNKNOWN)
+            if (nType <= sal_Int32(LanguageTag::ScriptType::RTL) && nType > sal_Int32(LanguageTag::ScriptType::UNKNOWN))
                 aLang.setScriptType(LanguageTag::ScriptType(nType));
             sal_uInt32 nPos = FindIndex(nLangType);
             if (nPos == RESARRAY_INDEX_NOTFOUND)