fix typos and includes

sc/source/core/tool/compiler.cxx

@@ -2712,7 +2712,7 @@ bool ScCompiler::IsPredetectedReference( const String& rName )
                     return false;   // :#REF!.AB42 or :#REF!42 or :#REF!#REF!
                 break;
             default:
-                if (comphelper::string::isalpha(c) &&
+                if (comphelper::string::isalphaAscii(c) &&
                         ((mnPredetectedReference > 1 && ':' == c2) || 0 == c2))
                     return false;   // AB#REF!: or AB#REF!
         }

xmlhelp/source/treeview/tvread.cxx

@@ -47,6 +47,7 @@
 #include <com/sun/star/uri/XUriReferenceFactory.hpp>
 #include <com/sun/star/uri/XVndSunStarExpandUrl.hpp>
 #include <comphelper/locale.hxx>
+#include <comphelper/string.hxx>
 
 namespace treeview {