libgimp: rename gimppropchooser.* to gimppropchooser-private.* and…

… don't include it from public gimpui.h.

As reviewed during !786, if this file is private, the name should show it
clearly. And of course, we must not include it from another public header, since
it won't be installed.

This also fixes building plug-ins with gimptool as reported by tmanni:
e00f2d7f50 (note_1650791)

libgimp/Makefile.am

@@ -146,9 +146,9 @@ libgimpui_sources = \
 
 libgimpui_built_sources = \
 	gimpuimarshal.c			\
-	gimpuimarshal.h     \
-	gimppropchooser.c   \
-	gimppropchooser.h
+	gimpuimarshal.h			\
+	gimppropchooser-private.c	\
+	gimppropchooser-private.h
 
 libgimpui_extra_sources = gimpuimarshal.list
 

libgimp/gimpproceduredialog.c

@@ -26,6 +26,8 @@
 
 #include "libgimpwidgets/gimpwidgets.h"
 
+#include "libgimp/gimppropchooser-private.h"
+
 #include "gimp.h"
 #include "gimpui.h"
 

libgimp/gimpui.h

@@ -44,7 +44,6 @@
 #include <libgimp/gimpproceduredialog.h>
 #include <libgimp/gimpprocview.h>
 #include <libgimp/gimpprogressbar.h>
-#include <libgimp/gimppropchooser.h>
 #include <libgimp/gimppropchooserfactory.h>
 #include <libgimp/gimpsaveproceduredialog.h>
 #include <libgimp/gimpzoompreview.h>

libgimp/meson.build

@@ -282,7 +282,7 @@ libgimpui_sources_introspectable = [
 libgimpui_sources = [
   libgimpui_sources_introspectable,
   gimpuimarshal,
-  'gimppropchooser.c',
+  'gimppropchooser-private.c',
 ]
 
 libgimpui_headers_introspectable = [