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support, make this explicit in src.opts.mk, by updating the default settings. The defaults become as follows: * If the host compiler is not C++11 capable, use gcc and disable clang. * On x86, enable clang, make it the default cc, and disable gcc. * On little-endian ARM, enable clang, but not the full build, make it the default cc, and disable gcc. * On PowerPC, enable clang, but enable gcc and make that the default cc. * On everything else, use gcc, and disable clang. This can be amended later, if we get e.g. sparc64 or big-endian ARM working with clang. Reviewed by: imp, brooks Differential Revision: https://reviews.freebsd.org/D1294
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