Add cmake toolchain for x86 support on linux.
- Properly respond to detection of i386 and x86 as the CPU. - Restrict -Wshadow to C files: it silences a large number of warnings caused by test code. BUG=https://bugs.chromium.org/p/aomedia/issues/detail?id=76 Change-Id: Ia15ae8ed0fa90aec587818bda778a638c811168d
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