build: Set the umask to 0022 before running the daemon for tests.

* test-env.in: Run "umask 0022" before running the daemon.
  Reported by Matthew Lien - 練喆明 <bluet@bluet.org>

test-env.in

@@ -56,6 +56,10 @@ then
     # Do that because store.scm calls `canonicalize-path' on it.
     mkdir -p "$NIX_STORE_DIR"
 
+    # Set the umask to avoid "suspicious ownership or permission" errors.
+    # See <http://lists.gnu.org/archive/html/bug-guix/2013-07/msg00033.html>.
+    umask 0022
+
     # Launch the daemon without chroot support because is may be
     # unavailable, for instance if we're not running as root.
     "@abs_top_builddir@/pre-inst-env"				\