Check for C++11 support in the configure script.

R=mark@chromium.org

Review URL: https://codereview.chromium.org/1570013002 .
diff --git a/configure.ac b/configure.ac
index da14d61..cbea712 100644
--- a/configure.ac
+++ b/configure.ac
@@ -76,6 +76,9 @@
 AX_PTHREAD
 AC_CHECK_HEADERS([a.out.h])
 
+m4_include(m4/ax_cxx_compile_stdcxx.m4)
+AX_CXX_COMPILE_STDCXX(11, noext, mandatory)
+
 # Only build Linux client libs when compiling for Linux
 case $host in
   *-*-linux* | *-android* )