[gnumeric] Fix introspection enabled out-of-source-directory build

[J.H.M. Dassen (Ray) <jdassen src gnome org>]

commit 1957b5dfe79ea557b10790861e8c89166f2f165c
Author: J.H.M. Dassen (Ray) <jdassen debian org>
Date:   Sun Oct 28 22:18:55 2012 +0100

    Fix introspection enabled out-of-source-directory build

 src/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index aa1b4e0..d326b0f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -6,6 +6,7 @@ INTROSPECTION_GIRS =
 INTROSPECTION_SCANNER_ARGS = \
 	-v --warn-all --accept-unprefixed \
 	--identifier-prefix="Gnm"  --identifier-prefix="Gnumeric" \
+	-I$(top_builddir) \
 	-DGOFFICE_NAMESPACE_DISABLE
 INTROSPECTION_COMPILER_ARGS = \
 	--includedir=$(srcdir) \