Add g++-multilib build dependency when cross building for ARM.

build/install-build-deps.sh

Index: build/install-build-deps.sh
diff --git a/build/install-build-deps.sh b/build/install-build-deps.sh
index f7a9cec9cf62c34a464d4d2593540b6e7419fb8c..a7cd0e33d33306eeeffd16ffcacb4785aaf5df29 100755
--- a/build/install-build-deps.sh
+++ b/build/install-build-deps.sh
@@ -106,8 +106,7 @@ arm_list="libc6-armel-cross libc6-dev-armel-cross libgcc1-armel-cross
           libgcc1-dbg-armel-cross libgomp1-dbg-armel-cross
           binutils-arm-linux-gnueabi cpp-arm-linux-gnueabi
           gcc-arm-linux-gnueabi g++-arm-linux-gnueabi
-          cpp-4.5-arm-linux-gnueabi gcc-4.5-arm-linux-gnueabi

[iannucci, 2012/12/17 19:52:23]

Are we sure these AREN'T used? Or are these implicit deps of g++-multilib?

-          g++-4.5-arm-linux-gnueabi libmudflap0-dbg-armel-cross"
+          libmudflap0-dbg-armel-cross"
 
 # Plugin lists needed for tests.
 plugin_list="flashplugin-installer"
@@ -194,6 +193,13 @@ else
   dbg_list=
 fi
 
+# When cross building for arm on 64-bit systems the host binaries
+# that are part of v8 need to be compiled with -m32 which means
+# that basic multilib support is needed.
+if [ "$(uname -m)" = "x86_64" ]; then
+  arm_list="$arm_list g++-multilib"
+fi
+
 if test "$do_inst_arm" = "1"; then
   . /etc/lsb-release
   if test "$DISTRIB_CODENAME" != "precise"; then