[patch] FOX 1.7.84 -> 1.7.85: Regression in FXObject.h

When FXObject.h is simply included, builds fail in projects such as
gogglesmm [1]. In 1.7.85, the inclusion of FXMetaClass.h was removed
from FXObject.h, causing the compiler to no longer recognize
FXSelector as a type in the FX namespace.

Example error from trying to build gogglesmm with LLVM 18.1.6 on
FreeBSD-CURRENT:
/usr/local/include/fox-1.7/FXObject.h:135:3: fatal error: no type
named 'FXSelector' in namespace 'FX'
  135 |   FXDECLARE(FXObject)
      |   ^~~~~~~~~~~~~~~~~~~
/usr/local/include/fox-1.7/FXObject.h:50:28: note: expanded from macro
'FXDECLARE'
   50 |    struct FXMapEntry { FX::FXSelector keylo; FX::FXSelector
keyhi; long (classname::* func)(FX::FXObject*,FX::FXSelector,void*);
}; \
      |                        ~~~~^

I've attached a patch to fix the issue and in case the ML scrubs
attachments, the patch can also be found here:
https://people.freebsd.org/~jhale/patches/fox-1.7.85-include-FXObject.h.diff

[1] https://github.com/gogglesmm/gogglesmm

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--- include/FXObject.h.orig	2024-06-30 15:47:37 UTC
+++ include/FXObject.h
@@ -25,6 +25,10 @@
 #include "FXCallback.h"
 #endif
 
+#ifndef FXMETACLASS_H
+#include "FXMetaClass.h"
+#endif
+
 namespace FX {