[Snek] [keith-packard/snek] f48b98: Cast M_PI to float when doing computations with it

[Keith Packard]

  Branch: refs/heads/master
  Home:   https://github.com/keith-packard/snek
  Commit: f48b9806f14f9e7a002d91c08ae767fd877f6e23
      https://github.com/keith-packard/snek/commit/f48b9806f14f9e7a002d91c08ae767fd877f6e23
  Author: Keith Packard <keithp at keithp.com>
  Date:   2019-11-29 (Fri, 29 Nov 2019)

  Changed paths:
    M snek-math.c

  Log Message:
  -----------
  Cast M_PI to float when doing computations with it

There doesn't appear to be a float version of M_PI, so
cast when using it in computations to avoid pulling in
double math code just for this.

Signed-off-by: Keith Packard <keithp at keithp.com>