Fix preprocessor definitions for wxBase build under OS X.

Define __WXOSX__ for non-GUI build under Darwin. Ensure that the rest of the
code compiles correctly when just __WXOSX__ is defined but neither of
__WXOSX_{CARBON,COCOA,IPHONE}__ is. This ensures that wxBase can actually be
built under Mac.

Move OS X symbols definitions in wx/platform.h after wx/setup.h inclusion as
they rely on __DARWIN__ and wxUSE_GUI values which are both define in that
file now. Still keep them before wx/chkconf.h inclusion which relies on
__WXOSX_XXX__ being defined. Yes, it's a mess and should be cleaned up more
permanently some day.

Also remove some redundancy from wx/osx/{carbon,cocoa}/private.h by factoring
out common parts into wx/osx/core/private.h. Also include this header itself
from wx/osx/private.h directly instead of including it thrice from different
sub-ports headers.

Closes #12660.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66077 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/core/private.h

@@ -32,13 +32,21 @@
     #define wxOSX_10_6_AND_LATER(x)
 #endif
 
-#if wxOSX_USE_COCOA_OR_CARBON
+#if !wxUSE_GUI || wxOSX_USE_COCOA_OR_CARBON
+
+// Carbon functions are currently still used in wxOSX/Cocoa too (including
+// wxBase part of it).
+#include <Carbon/Carbon.h>
 
 WXDLLIMPEXP_BASE long UMAGetSystemVersion() ;
 
 void WXDLLIMPEXP_CORE wxMacStringToPascal( const wxString&from , unsigned char * to );
 wxString WXDLLIMPEXP_CORE wxMacMakeStringFromPascal( const unsigned char * from );
 
+WXDLLIMPEXP_BASE wxString wxMacFSRefToPath( const FSRef *fsRef , CFStringRef additionalPathComponent = NULL );
+WXDLLIMPEXP_BASE OSStatus wxMacPathToFSRef( const wxString&path , FSRef *fsRef );
+WXDLLIMPEXP_BASE wxString wxMacHFSUniStrToString( ConstHFSUniStr255Param uniname );
+
 #endif
 
 #if wxUSE_GUI