[gtk-doc] tests: disable pararrel make for bootstrap test

[Stefan Kost <stefkost src gnome org>]

commit 7b38b9de8f26e526967ee4a0ff08454a794508fb
Author: Stefan Kost <ensonic users sf net>
Date:   Wed Dec 15 10:09:54 2010 +0200

    tests: disable pararrel make for bootstrap test
    
    This should fix the signle test failure on build.gnome.org, as long as we have
    no better idea how to handle make dependencies for generated files.

 tests/empty/docs/Makefile.am |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/tests/empty/docs/Makefile.am b/tests/empty/docs/Makefile.am
index a3d4509..4c28740 100644
--- a/tests/empty/docs/Makefile.am
+++ b/tests/empty/docs/Makefile.am
@@ -1,5 +1,11 @@
 ## Process this file with automake to produce Makefile.in
 
+# this tests bootstraps gtk-doc, that includes generating a default 
+# DOC_MAIN_SGML_FILE
+# right now that fails with parallel make, as make cannot see that what is a
+# dependency for another target is generated as needed
+MAKEFLAGS = -j1
+
 # We require automake 1.6 at least.
 AUTOMAKE_OPTIONS = 1.6