[PATCH] build: avoid bootstrap failure

Without this change, trying to bootstrap GNU sed from a freshly-cloned
Git checkout aborts with an error like this:

  ./bootstrap: aclocal --force -I m4 ...
  ./bootstrap: autoconf --force ...
  configure.ac:20: error: possibly undefined macro: gl_DISABLE_THREADS
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.

* bootstrap.conf (gnulib_modules): Add 'threadlib'.

Copyright-paperwork-exempt: yes
Signed-off-by: Stefano Lattarini <[email protected]>
---
 ChangeLog      | 5 +++++
 bootstrap.conf | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 133b56a..e0b36b4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2012-12-29  Stefano Lattarini  <[email protected]>  (tiny change)
 
+	build: avoid bootstrap failure
+	* bootstrap.conf (gnulib_modules): Add 'threadlib'.
+
+2012-12-29  Stefano Lattarini  <[email protected]>  (tiny change)
+
 	build: use AC_CONFIG_HEADERS, not AM_CONFIG_HEADER
 	* configure.ac: Here.  The latter has been removed in Automake 1.13.
 
diff --git a/bootstrap.conf b/bootstrap.conf
index c6919ac..48ab2aa 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -20,7 +20,7 @@
 gnulib_modules="
     acl alloca btowc c-ctype extensions fwriting getdelim getopt gettext-h
     localcharset mbrlen mbrtowc mbsinit memchr mkostemp obstack pathmax regex
-    rename selinux-h stdbool stat-macros ssize_t strerror strverscmp
+    rename selinux-h stdbool stat-macros ssize_t strerror strverscmp threadlib
     unlocked-io verify version-etc-fsf wcrtomb wctob"
 
 checkout_only_file=
-- 
1.8.1.rc3.27.g3b73c7d