[evolution-data-server] Fix distcheck error.

[Matthew Barnes <mbarnes src gnome org>]

commit 5eddd71636d182938394be0fe8ebac10d22cff3a
Author: Matthew Barnes <mbarnes redhat com>
Date:   Sun Nov 17 09:21:11 2013 -0500

    Fix distcheck error.

 docs/reference/camel/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/camel/Makefile.am b/docs/reference/camel/Makefile.am
index a987bc7..899d8d4 100644
--- a/docs/reference/camel/Makefile.am
+++ b/docs/reference/camel/Makefile.am
@@ -21,6 +21,7 @@ MKDB_OPTIONS = --sgml-mode --output-format=xml --name-space=camel
 # CFLAGS and LDFLAGS for compiling gtkdoc-scangobj with your library.
 GTKDOC_CFLAGS = \
        -I$(top_srcdir) \
+       -I$(top_srcdir)/camel/providers \
        -I$(top_builddir) \
        -I$(top_builddir)/camel \
        -I$(top_builddir)/camel/providers \