scripts: add schemetable.c

This tool generates a scheme-matching table.

It iterates over a number of different initial and shift values in order
to find the hash algorithm that

scripts: add schemetable.c

This tool generates a scheme-matching table.

It iterates over a number of different initial and shift values in order
to find the hash algorithm that needs the smallest possible table.

The generated hash function, table and table size then needs to be used
by the url.c:Curl_getn_scheme_handler() function.

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