[Snek] [keith-packard/snek] c8bdc1: Add OPT value in posix/Makefile to hold desired op...

[Keith Packard]

  Branch: refs/heads/master
  Home:   https://github.com/keith-packard/snek
  Commit: c8bdc12228cd65bff24557af8b3b7701cac475f3
      https://github.com/keith-packard/snek/commit/c8bdc12228cd65bff24557af8b3b7701cac475f3
  Author: Keith Packard <keithp at keithp.com>
  Date:   2019-02-11 (Mon, 11 Feb 2019)

  Changed paths:
    M posix/Makefile

  Log Message:
  -----------
  Add OPT value in posix/Makefile to hold desired optimization

Useful when testing effect of various optimization levels to not
have to edit Makefile or reproduce CFLAGS on the command line

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