On some Tier-2 platforms (e.g. PowerPC), clang kind of works and so is

installed but is not cc. On such platforms, clang is usually not default
for a reason and so using it for C++11 is unwise. Instead, fall back to
newer GCC. On i386 and amd64, clang works even if it isn't the default,
so continue using it there.

This fixes the build for Boost, among other software, on PowerPC.

Approved by:	bapt

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