Add wx/generic/collheaderctrl.h to the list of GUI headers

This file is used by the public wx/collheaderctrl.h but wasn't previously
installed, breaking the build of any code including that header under Unix.

Closes #17309.

Makefile.in

@@ -4114,6 +4114,7 @@ COND_USE_GUI_1_ALL_GUI_HEADERS =  \
 	wx/xrc/xmlreshandler.h \
 	wx/systhemectrl.h \
 	wx/collheaderctrl.h \
+	wx/generic/collheaderctrl.h \
 	$(LOWLEVEL_HDR) \
 	$(GUI_CORE_HEADERS) \
 	$(ADVANCED_HDR) \

build/bakefiles/files.bkl

@@ -1181,6 +1181,7 @@ IMPORTANT: please read docs/tech/tn0016.txt before modifying this file!
     wx/xrc/xmlreshandler.h
     wx/systhemectrl.h
     wx/collheaderctrl.h
+    wx/generic/collheaderctrl.h
 </set>
 
 <!-- ====================================================================== -->

build/files

@@ -698,6 +698,7 @@ GUI_CMN_HDR =
     wx/generic/accel.h
     wx/generic/buttonbar.h
     wx/generic/choicdgg.h
+    wx/generic/collheaderctrl.h
     wx/generic/combo.h
     wx/generic/custombgwin.h
     wx/generic/dcpsg.h