64-bit system need 32bit libstdc++.so.6 to run pnacl sdk clang

To build chromium, NaCl SDK should work for internally used NaCl library.
32bit version of clang is used as a part of pnacl sdk toolchain, and requires
libstdc++.so.6.

BUG=none


Review URL: https://chromiumcodereview.appspot.com/11141009

git-svn-id: http://src.chromium.org/svn/trunk/src/build@161831 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

install-build-deps.sh

@@ -70,10 +70,10 @@ dev_list="apache2.2-bin bison curl elfutils fakeroot flex g++ gperf
           $chromeos_dev_list"
 
 # 64-bit systems need a minimum set of 32-bit compat packages for the pre-built
-# NaCL binaries. These are always needed, regardless of whether or not we want
+# NaCl binaries. These are always needed, regardless of whether or not we want
 # the full 32-bit "cross-compile" support (--lib32).
 if [ "$(uname -m)" = "x86_64" ]; then
-  dev_list="${dev_list} libc6-i386 lib32gcc1"
+  dev_list="${dev_list} libc6-i386 lib32gcc1 lib32stdc++6"
 fi
 
 # Run-time libraries required by chromeos only