[evolution-data-server] Avoid including <db.h> in a public header file.

[Matthew Barnes <mbarnes src gnome org>]

commit 938f0348232e4b0b093e413b8371059f96528092
Author: Matthew Barnes <mbarnes redhat com>
Date:   Wed Jun 27 08:15:52 2012 -0400

    Avoid including <db.h> in a public header file.
    
    Don't want Berkeley DB to be a requirement in libedata-book.pc.

 .../libedata-book/e-book-backend-db-cache.c        |    2 ++
 .../libedata-book/e-book-backend-db-cache.h        |    4 +++-
 2 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/addressbook/libedata-book/e-book-backend-db-cache.c b/addressbook/libedata-book/e-book-backend-db-cache.c
index 9b9c055..3e7086d 100644
--- a/addressbook/libedata-book/e-book-backend-db-cache.c
+++ b/addressbook/libedata-book/e-book-backend-db-cache.c
@@ -23,6 +23,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <db.h>
+
 #include "e-book-backend-db-cache.h"
 #include "e-book-backend.h"
 #include "e-book-backend-sexp.h"
diff --git a/addressbook/libedata-book/e-book-backend-db-cache.h b/addressbook/libedata-book/e-book-backend-db-cache.h
index 58cf044..b0742ca 100644
--- a/addressbook/libedata-book/e-book-backend-db-cache.h
+++ b/addressbook/libedata-book/e-book-backend-db-cache.h
@@ -27,10 +27,12 @@
 #define E_BOOK_BACKEND_DB_CACHE_H
 
 #include <libebook/libebook.h>
-#include "db.h"
 
 G_BEGIN_DECLS
 
+/* Avoid including <db.h> in a public header file. */
+typedef struct __db DB;
+
 EContact * e_book_backend_db_cache_get_contact (DB *db, const gchar *uid);
 gchar *e_book_backend_db_cache_get_filename (DB *db);
 void e_book_backend_db_cache_set_filename (DB *db, const gchar *filename);