[tremor] Tremor's use of 64-bit math

[slothead]

>Note I'd not worry, profiling shows that most time is spent in other places:
>Each sample counts as 0.01 seconds.
>  % cumulative self self total
> time seconds seconds calls us/call us/call name
> ...
> 19.80 36.97 14.88 30928 481.12 481.12 vorbis_lsp_to_curve
>  9.99 44.48 7.51 611549 12.28 19.28

I was about to do the ARM-ASM trick for the floor0.c code until I saw that floor0 went the way of
the dodo.  I get 33% CPU use for the decoder on an ARM 200 mhz.  I get a feeling that's about the
norm and if I want faster I need a bigger, badder motor.

File: floor0.c
   136: void vorbis_lsp_to_curve(ogg_int32_t *curve,int *map,int n,int ln,
   416:     vorbis_lsp_to_curve(out,look->linearmap,look->n,look->ln,

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