[cogl] build: Fix generation of the documentation Makefiles

[Damien Lespiau <dlespiau src gnome org>]

commit 97abcda1a2771df13228da92dc6b975088d86bd6
Author: Damien Lespiau <damien lespiau intel com>
Date:   Wed May 18 14:14:28 2011 +0100

    build: Fix generation of the documentation Makefiles
    
    Automake seems a bit fragile when trying to do cunning things like
    including a file with "-include". It does not recurse into that file (if
    it exists) to generate the final Makefiles.
    
    Let's add a if BUILD_GTK_DOC guard around the gtk-doc.make inclusion
    instead, hopefully should work as intended.

 doc/reference/cogl-2.0/Makefile.am |    4 +++-
 doc/reference/cogl/Makefile.am     |    4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/doc/reference/cogl-2.0/Makefile.am b/doc/reference/cogl-2.0/Makefile.am
index 9e61c2f..51a1b8b 100644
--- a/doc/reference/cogl-2.0/Makefile.am
+++ b/doc/reference/cogl-2.0/Makefile.am
@@ -143,7 +143,9 @@ GTKDOC_LIBS=$(top_builddir)/cogl/libcogl.la $(COGL_DEP_LIBS)
 
 # This includes the standard gtk-doc make rules, copied by gtkdocize.
 EXTRA_DIST =
--include $(top_srcdir)/gtk-doc.make
+if BUILD_GTK_DOC
+include $(top_srcdir)/gtk-doc.make
+endif
 
 # Other files to distribute
 # e.g. EXTRA_DIST += version.xml.in
diff --git a/doc/reference/cogl/Makefile.am b/doc/reference/cogl/Makefile.am
index 614494f..66550cc 100644
--- a/doc/reference/cogl/Makefile.am
+++ b/doc/reference/cogl/Makefile.am
@@ -140,7 +140,9 @@ GTKDOC_LIBS=$(top_builddir)/cogl/libcogl.la $(COGL_DEP_LIBS)
 
 # This includes the standard gtk-doc make rules, copied by gtkdocize.
 EXTRA_DIST =
--include $(top_srcdir)/gtk-doc.make
+if BUILD_GTK_DOC
+include $(top_srcdir)/gtk-doc.make
+endif
 
 # Other files to distribute
 # e.g. EXTRA_DIST += version.xml.in