[pangomm] Fix reference documentation generation

[Chun-wei Fan <fanchunwei src gnome org>]

commit b7ad0bd0f8555a021c04a1afe8e1b2a15e9a35c0
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Sep 10 11:09:40 2018 +0800

    Fix reference documentation generation
    
    * pango/pangomm/Makefile.am:
    * pango/pangomm/filelist.gmake.am: Split out again the autotools-specific
    portion that we previously split out from pango/pangomm/filelist.am into a
    file of its own.
    * docs/Makefile.am: Include pango/pangomm/filelist.gmake.am to ensure the
    reference documentation is generated for all files.

 docs/Makefile.am                | 2 +-
 pango/pangomm/Makefile.am       | 5 +----
 pango/pangomm/filelist.gmake.am | 6 ++++++
 3 files changed, 8 insertions(+), 5 deletions(-)
---
diff --git a/docs/Makefile.am b/docs/Makefile.am
index 35cc297..774ea72 100644
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -16,7 +16,7 @@
 ## along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 include $(top_srcdir)/pango/src/filelist.am
-include $(top_srcdir)/pango/pangomm/filelist.am
+include $(top_srcdir)/pango/pangomm/filelist.gmake.am
 
 pangomm_files_h = $(files_built_h) $(filter-out wrap_init.h,$(files_extra_h))
 
diff --git a/pango/pangomm/Makefile.am b/pango/pangomm/Makefile.am
index 1d0dbd4..f1ac2b7 100644
--- a/pango/pangomm/Makefile.am
+++ b/pango/pangomm/Makefile.am
@@ -18,10 +18,7 @@
 lib_LTLIBRARIES = libpangomm-@PANGOMM_API_VERSION@.la
 
 include $(srcdir)/../src/filelist.am
-include $(srcdir)/filelist.am
-
-# Split out from $(srcdir)/filelist.am
-files_built_ph = $(patsubst %.hg,private/%_p.h,$(files_hg))
+include $(srcdir)/filelist.gmake.am
 
 include $(top_srcdir)/build/compile-binding.am
 
diff --git a/pango/pangomm/filelist.gmake.am b/pango/pangomm/filelist.gmake.am
new file mode 100644
index 0000000..527f580
--- /dev/null
+++ b/pango/pangomm/filelist.gmake.am
@@ -0,0 +1,6 @@
+## This file is part of pangomm.
+
+include $(top_srcdir)/pango/pangomm/filelist.am
+
+# Split out from $(top_srcdir)/pango/pangomm/filelist.am
+files_built_ph = $(patsubst %.hg,private/%_p.h,$(files_hg))