Disable wxUSE_ACTIVITYINDICATOR if wxUSE_GRAPHICS_CONTEXT==0.

wxActivityIndicatorImpl requires wxGraphicsContext to compile successfully (it
is used to implement anti-aliased drawing of the control).

Add a check to enforce this.

Closes #16921

include/wx/chkconf.h

@@ -2247,6 +2247,15 @@
 #   endif
 #endif /* wxUSE_PREFERENCES_EDITOR */
 
+#if wxUSE_ACTIVITYINDICATOR && !wxUSE_GRAPHICS_CONTEXT
+#   ifdef wxABORT_ON_CONFIG_ERROR
+#       error "wxUSE_ACTIVITYINDICATOR requires wxGraphicsContext"
+#   else
+#       undef wxUSE_ACTIVITYINDICATOR
+#       define wxUSE_ACTIVITYINDICATOR 0
+#   endif
+#endif /* wxUSE_ACTIVITYINDICATOR */
+
 #endif /* wxUSE_GUI */
 
 #endif /* _WX_CHKCONF_H_ */