FFI: make gcc command clearer

[kraktus]

Didn't check if gcc was accepting the flag without space but it definitely reduced the comprehension when first encountering it.

[ehuss]

gcc explicitly recommends not using separate arguments. I'd be a little leery of using a form that isn't recommended (and pretty rare in my experience). I understand that it can look a little strange, but I think I would prefer to keep with established norms.

[kraktus]

I see, I was not aware of this convention. it is only established for the -l flag? Since other args are separate arguments (well only the output one)

[ehuss]

-l and -L are the ones I am most aware of that usually do not use a space. Long flags usually use an equals or a space.

[kraktus]

Ok thanks for the feedback!