[fluid-dev] Import few fixes into 2.0.0

[Carlo Bramini]

Hello,

I was wondering if it could be possible to import few fixes from the "compile 
time constant lookup tables" branch into the upcoming 2.0.0 release:

1) Replace log(10.0) with macro M_LN10 into fluid_rvoice.c

2) Simplify the calculation of fluid_convex_tab[] and fluid_concave_tab[] 
values inside fluid_conv.c, by using the properties of the logarithms.

They should be simple and absolutely safe corrections.
What do you think?
Sincerely.