ENH: improve runtime detection of CPU features

  - Put the old CPU detection code to rest

    The current CPU detection code only supports x86 and
    it's count on compiler built-in functions that not widely supported
    by other compilers or platforms.

    NOTE: `npy_cpu_supports` is removed rather than deprecated,
     use the macro `NPY_CPU_HAVE(FEATURE_NAME_WITHOUT_QUOTES)` instead.

  - Initialize the new CPU features runtime detector

    Almost similar to GCC built-in functions,
    so instead of `__builtin_cpu_init`, `__builtin_cpu_supports`
    its provide `npy_cpu_init`, `npy_cpu_have` and `NPY_CPU_HAVE`.

    NOTE: `npy_cpu_init` must be called before any use of
    `npy_cpu_have` and `NPY_CPU_HAVE`, however `npy_cpu_init`
    already called during the load of module `umath`
    so there's no reason to call it again in most of the cases.

  - Add X86 support

    detect almost all x86 features, also provide
    CPU feature groups that gather several features.
    e.g. `AVX512_KNM` detect Knights Mill's `AVX512` features

  - Add IBM/Power support

    only supports Linux and count here on `glibc(getauxval)`
    to detect VSX support and fail-back to the compiler definitions
    for other platforms.

  - Add ARM support

    Same as IBM/Power but its parse `/proc/self/auxv`
    if `glibc(getauxval)` isn't available.

  - Update umath generator

  - Add testing unit for Linux only

  - Add new attribute `__cpu_features__` to umath module

    `__cpu_features__` is a dictionary contains all supported
    CPU feature names with runtime availability

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