[gtksourceview] build: ignore gtksource.h for building the docs

[Sébastien Wilmet <swilmet src gnome org>]

commit 3f7a9d7c7d46a3e326c1f0c55614d956477c216c
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Jun 25 00:04:59 2016 +0200

    build: ignore gtksource.h for building the docs
    
    It adds GTK_SOURCE_H_INSIDE to gtksourceview-3.0-unused.txt.
    But GTK_SOURCE_H_INSIDE is also added from the words completion provider
    header.

 docs/reference/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/Makefile.am b/docs/reference/Makefile.am
index a95cf0a..a6f6b16 100644
--- a/docs/reference/Makefile.am
+++ b/docs/reference/Makefile.am
@@ -30,6 +30,7 @@ EXTRA_HFILES =                                                                \
 # e.g. IGNORE_HFILES=gtkdebug.h gtkintl.h private_code
 IGNORE_HFILES =                                        \
        config.h                                \
+       gtksource.h                             \
        gtksourcebuffer-private.h               \
        gtksourcebufferinputstream.h            \
        gtksourcebufferoutputstream.h           \