Install libraries needed by GCC build.
Install libraries needed by GCC build.

If you want to use system-wide gmp, mpfr and mpc then
you can not easily do that because AMD64 version of
Ubuntu only supplied dev packages for 64bit development.
This script simplifies installation of 32bit libraries.
Review URL: http://codereview.chromium.org/6822002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@4799 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client