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mpconfig.h: Add basic support for target endianness configuration.
A specific target can define either MP_ENDIANNESS_LITTLE or MP_ENDIANNESS_BIG to 1. Default is MP_ENDIANNESS_LITTLE. TODO: Autodetect based on compiler predefined macros?
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‎py/mpconfig.h‎

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@@ -169,6 +169,11 @@ typedef double mp_float_t;
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// machine_int_t value with most significant bit set
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#define WORD_MSBIT_HIGH (((machine_uint_t)1) << (BYTES_PER_WORD * 8 - 1))
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#if !defined(MP_ENDIANNESS_LITTLE) && !defined(MP_ENDIANNESS_BIG)
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// Just because most archs are such?
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#define MP_ENDIANNESS_LITTLE (1)
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#endif
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// printf format spec to use for machine_int_t and friends
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#ifndef INT_FMT
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#ifdef __LP64__

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