[glib] Makefile.am: move gtk-doc.make back to EXTRA_DIST

[Ryan Lortie <ryanl src gnome org>]

commit 15477ebd4216a6d71556eb381974b0dd93019dda
Author: Ryan Lortie <desrt desrt ca>
Date:   Wed Jun 5 18:46:29 2013 -0400

    Makefile.am: move gtk-doc.make back to EXTRA_DIST
    
    0192c599377c35cc465eed1ae61de56d5a1034e8 moved this file from EXTRA_DIST TO
    BUILT_EXTRA_DIST for an unknown reason.
    
    Having it here causes the timestamp to be updated during 'make dist' to
    something newer than docs/reference/*/Makefile.in.  This is a problem
    because those Makefile.in are generated by including gtk-doc.make, so
    automake becomes convinced that they need to be regenerated.  This is a
    problem for people who don't have automake installed, or have the wrong
    version.
    
    The timestamp problem has been around for quite a while, but it only
    became a problem recently after automake changed policy about this in
    commit a22717dffe37f30ef2ad2c355b68c9b3b5e4b8c7.
    
    Specifically:
    
    https://bugzilla.gnome.org/show_bug.cgi?id=700350

 Makefile.am |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 807bc60..a156f85 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -58,7 +58,9 @@ EXTRA_DIST +=                         \
        gio-2.0.pc.in           \
        gio-unix-2.0.pc.in      \
        gio-windows-2.0.pc.in   \
-       check-abis.sh
+       check-abis.sh           \
+       gtk-doc.make            \
+       $(NULL)
 
 
 # These may be in the builddir too
@@ -67,7 +69,7 @@ BUILT_EXTRA_DIST +=           \
        INSTALL                 \
        ChangeLog               \
        config.h.win32          \
-       gtk-doc.make
+       $(NULL)
 
 CONFIGURE_DEPENDENCIES = acglib.m4