[evolution-ews] Use automake subdir-objects option

[Milan Crha <mcrha src gnome org>]

commit 482d1e9f2ca097d564fb2297a9c59fce0a3af98b
Author: Milan Crha <mcrha redhat com>
Date:   Fri Feb 6 08:09:03 2015 +0100

    Use automake subdir-objects option
    
    As suggested by automake, due to source files being referenced
    in sub-directories.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 42cf9fa..3923766 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,7 +8,7 @@ m4_define([ews_version],
 
 AC_PREREQ(2.58)
 AC_INIT([evolution-ews], [ews_version], [http://bugzilla.gnome.org/browse.cgi?product=evolution-ews])
-AM_INIT_AUTOMAKE([gnu 1.9 dist-xz no-dist-gzip -Wno-portability tar-ustar])
+AM_INIT_AUTOMAKE([gnu 1.9 dist-xz no-dist-gzip subdir-objects -Wno-portability tar-ustar])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR(README)
 AC_CONFIG_HEADERS(config.h)