[vala] build: Note that we don't support srcdir != builddir

[Colin Walters <walters src gnome org>]

commit 1ac3a89bbe66a822013627aacefe519e92e3aa2a
Author: Colin Walters <walters verbum org>
Date:   Thu Jan 19 10:31:06 2012 -0500

    build: Note that we don't support srcdir != builddir

 configure.ac |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 12192cd..31d6909 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,6 +7,12 @@ AM_INIT_AUTOMAKE([1.11 dist-bzip2])
 AM_MAINTAINER_MODE([enable])
 
 PACKAGE_SUFFIX=-0.18
+
+dnl http://people.gnome.org/~walters/docs/build-api.txt
+dnl We don't support separate builddir when building from git
+echo \#buildapi-variable-no-builddir >/dev/null
+
+PACKAGE_SUFFIX=-0.16
 AC_SUBST(PACKAGE_SUFFIX)
 AC_DEFINE_UNQUOTED(PACKAGE_SUFFIX, "$PACKAGE_SUFFIX", [Define to the suffix of this package])