mruby/mruby — pull request #1586 by cremno (2013-11-18 20:29:52+00:00)
Title: GCC: add -std=gnu99 to CFLAGS

- this change prevents issues like #1539 in the future
- Clang's default is already gnu99 but GCC's is gnu89
- mruby is C99 (+ GNU exts), not C89 (+ GNU exts)