[Patch] First bits of char16_t, char32_t support

[PAOLO.CARLINI@ORACLE.COM]

... Kris pointed out in private that of course short unsigned int and unsigned int are just the *default* underlying types: of course, just consider targets where unsigned ints are 16 bits wide. Therefore I decided to change the numeric_limits test the safe way, by using, when available, <cstdint>, thus the exact definition of char16_t and char32_t. Tested x86_64-linux, will commit in a moment.

Paolo.

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