Replace tabs to spaces

[davispuh]

Previously when I resolved conflict for rebase my editor used tabs instead of spaces so fix that now to spaces.

[davispuh]

I wonder whether new ffi-compiler version could be released and pushed to RubyGems?

[davispuh]

so it looks like I'll have to fork this and publish ffi-compiler2 as no one is maintaining this anymore?

[davispuh]

I've done it, released ffi-compiler2 It includes this PR

Source at:

• https://gitlab.com/davispuh/ffi-compiler
• https://bitbucket.org/davispuh/ffi-compiler
• https://github.com/davispuh/ffi-compiler