macos 10.15 build

adapt to removed headers, add version defines

include/wx/platform.h

@@ -47,6 +47,12 @@
 #    ifndef MAC_OS_X_VERSION_10_13
 #       define MAC_OS_X_VERSION_10_13 101300
 #    endif
+#    ifndef MAC_OS_X_VERSION_10_14
+#       define MAC_OS_X_VERSION_10_14 101400
+#    endif
+#    ifndef MAC_OS_X_VERSION_10_15
+#       define MAC_OS_X_VERSION_10_15 101500
+#    endif
 #    if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_13
 #        ifndef NSAppKitVersionNumber10_10
 #            define NSAppKitVersionNumber10_10 1343

src/html/htmlctrl/webkit/webkit.mm

@@ -21,8 +21,10 @@
 #include "wx/osx/private.h"
 
 #include <WebKit/WebKit.h>
+#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_15
 #include <WebKit/HIWebView.h>
 #include <WebKit/CarbonUtils.h>
+#endif
 
 #include "wx/html/webkit.h"
 

src/osx/webview_webkit.mm

@@ -33,9 +33,11 @@
 #include <UIKit/UIWebView.h>
 #else
 #include <WebKit/WebKit.h>
+#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_15
   #include <WebKit/HIWebView.h>
   #include <WebKit/CarbonUtils.h>
 #endif
+#endif
 #include <Foundation/NSURLError.h>
 
 // using native types to get compile errors and warnings