* generic/tcl.h: Changed the typedef for the mp_digit type

        from:
                typedef unsigned long mp_digit;
        to:
                typedef unsigned int mp_digit;
        For 32-bit builds where "long" and "int" are two names for the same
        thing, this is no change at all.  For 64-bit builds, though, this
        causes the dp[] array of an mp_int to be made up of 32-bit elements
        instead of 64-bit elements.  This is a huge improvement because details
        elsewhere in the mp_int implementation cause only 28 bits of each
        element to be actually used storing number data.  Without this change
        bignums are over 50% wasted space on 64-bit systems.  [Bug 2800740].

        ***POTENTIAL INCOMPATIBILITY***
        For 64-bit builds, callers of routines with (mp_digit) or (mp_digit *)
        arguments *will*, and callers of routines with (mp_int *) arguments
        *may* suffer both binary and stubs incompatibilities with Tcl releases
        8.5.0 - 8.5.7.  Such possibilities should be checked, and if such
        incompatibilities are present, suitable [package require] requirements
        on the Tcl release should be put in place to keep such built code
        [load]-ing only in Tcl interps that are compatible.

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