[cheese] build-sys: Annotate we don't support srcdir != builddir from git

[Colin Walters <walters src gnome org>]

commit 9cd86c5d36d276a67023e520ae15a2c75f1d5255
Author: Colin Walters <walters verbum org>
Date:   Fri Jan 22 10:13:28 2016 -0500

    build-sys: Annotate we don't support srcdir != builddir from git
    
    Due to vala.

 configure.ac |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index d83d287..57aae6d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,6 +15,10 @@ AM_INIT_AUTOMAKE([1.12 -Wall -Wno-portability dist-xz no-define no-dist-gzip nos
 AM_MAINTAINER_MODE([enable])
 AM_SILENT_RULES([yes])
 
+dnl https://github.com/cgwalters/build-api
+dnl We don't support separate builddir when building from git
+echo \#buildapi-variable-no-builddir >/dev/null
+
 # Check for programs
 AC_PROG_CC
 AM_PROG_CC_C_O