Make OUStringLiteral1 a wrapper around UTF-16 instead of just ASCII

...not merely an ASCII character

Change-Id: Id2b381b35fe3a15574728ed973d60263dfef7249
Reviewed-on: https://gerrit.libreoffice.org/28446
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

compilerplugins/clang/stringstatic.cxx

@@ -66,13 +66,6 @@ bool StringStatic::VisitVarDecl(VarDecl const* varDecl)
     if (ignoreLocation(varDecl)) {
         return true;
     }
-    // We could use OUStringLiteral1 here, but we'd need to update OUStringLiteral1 to allow BMP chars first:
-    if (compiler.getSourceManager().getFilename(varDecl->getLocation())
-        == SRCDIR "/chart2/inc/SpecialUnicodes.hxx")
-    {
-        return true;
-    }
-
     QualType qt = varDecl->getType();
     if (!varDecl->hasGlobalStorage()
         || !varDecl->isThisDeclarationADefinition()