setup_board: bump the expected version of glibc

BUG=chromium-os:29678
TEST=x86-alex build, manual testing
CQ-DEPEND=I61721b963e5dca58f09afd485ae1d7a0fbb61ce5

Change-Id: Ib9da80cd1ad6484d7554616b60fe160124d75954
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/20764
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/setup_board b/setup_board
index 1e500f4..69a8c63 100755
--- a/setup_board
+++ b/setup_board
@@ -50,7 +50,7 @@
   "Version of binutils to use."
 DEFINE_string gcc_version "4.6.0-r13" \
   "Version of gcc to use."
-DEFINE_string libc_version "2.11.1-r3" \
+DEFINE_string libc_version "2.11.1-r4" \
   "Version of libc to use."
 DEFINE_string kernel_version "3.1" \
   "Version of kernel headers to use."