Add wx/persist/combobox.h to the headers list

In particular this ensures that it is installed by "make install".

See #24157.

Makefile.in

@@ -3894,6 +3894,7 @@ COND_USE_GUI_1_ALL_GUI_HEADERS =  \
 	wx/bmpbndl.h \
 	wx/filedlgcustomize.h \
 	wx/compositebookctrl.h \
+	wx/persist/combobox.h \
 	$(LOWLEVEL_HDR) \
 	$(GUI_CORE_HEADERS) \
 	wx/mediactrl.h \

build/bakefiles/files.bkl

@@ -1324,6 +1324,7 @@ IMPORTANT: please read docs/tech/tn0016.txt before modifying this file!
     wx/bmpbndl.h
     wx/filedlgcustomize.h
     wx/compositebookctrl.h
+    wx/persist/combobox.h
 </set>
 
 <!-- ====================================================================== -->

build/cmake/files.cmake

@@ -1225,6 +1225,7 @@ set(GUI_CMN_HDR
     wx/bmpbndl.h
     wx/filedlgcustomize.h
     wx/compositebookctrl.h
+    wx/persist/combobox.h
 )
 
 set(UNIX_SRC

build/files

@@ -1152,6 +1152,7 @@ GUI_CMN_HDR =
     wx/peninfobase.h
     wx/persist.h
     wx/persist/bookctrl.h
+    wx/persist/combobox.h
     wx/persist/dataview.h
     wx/persist/splitter.h
     wx/persist/toplevel.h

build/msw/wx_core.vcxproj

@@ -1518,6 +1518,7 @@
     <ClInclude Include="..\..\include\wx\filedlgcustomize.h" />
     <ClInclude Include="..\..\include\wx\compositebookctrl.h" />
     <ClInclude Include="..\..\include\wx\msw\darkmode.h" />
+    <ClInclude Include="..\..\include\wx\persist\combobox.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

build/msw/wx_core.vcxproj.filters

@@ -2056,6 +2056,9 @@
     <ClInclude Include="..\..\include\wx\persist\bookctrl.h">
       <Filter>Common Headers</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\include\wx\persist\combobox.h">
+      <Filter>Common Headers</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\include\wx\persist\dataview.h">
       <Filter>Common Headers</Filter>
     </ClInclude>