til_str: realloc in increasingly larger increments

Typically people do a exponential style growth in such
circumstances, but in my experience that tends to allocate nearly
double what's needed quite often.

Trying just a linearly increasing allocation size that bumps up
the minimum amount every time a resize is triggered.  If the
needed amount exceeds the new growth increment, the larger value
is used, but the growth rate still follows the minimum bump.

I expect this to evolve more, just wanted to do something to
speed up til_str a bit from it's naive approach.

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