Fix builds with ${B} != ${S}

Upstream-Status: Pending

RP 2014/7/17

Index: libotr-4.0.0/toolkit/Makefile.am
===================================================================
--- libotr-4.0.0.orig/toolkit/Makefile.am	2014-07-16 18:09:59.777858022 +0000
+++ libotr-4.0.0/toolkit/Makefile.am	2014-07-17 06:28:51.359066155 +0000
@@ -1,4 +1,4 @@
-AM_CPPFLAGS = -I../src @LIBGCRYPT_CFLAGS@
+AM_CPPFLAGS = -I$(top_srcdir)/src @LIBGCRYPT_CFLAGS@
 
 noinst_HEADERS = aes.h ctrmode.h parse.h sesskeys.h readotr.h sha1hmac.h