use #if wxUSE_UNICODE instead of #ifdefs (which totally broke ANSI build)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54739 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/textctrl.cpp

@@ -968,7 +968,7 @@ void wxTextCtrl::DoSetValue( const wxString &value, int flags )
         return;
     }
 
-#ifdef wxUSE_UNICODE
+#if wxUSE_UNICODE
     const wxCharBuffer buffer(value.utf8_str());
 #else
     wxFontEncoding enc = m_defaultStyle.HasFont()
@@ -1024,7 +1024,7 @@ void wxTextCtrl::WriteText( const wxString &text )
         return;
     }
 
-#ifdef wxUSE_UNICODE
+#if wxUSE_UNICODE
     const wxCharBuffer buffer(text.utf8_str());
 #else
     // check if we have a specific style for the current position