It would be very helpful if `pragma(inline)` in its various forms was added to
GDC's grammar, even if it doesn't actually do anything.

Currently, even with -fignore-unknown-pragmas, GDC will choke on
    pragma(inline, true):
Or
    pragma(inline, true) {
    }

I have not found a practical way to work around this with `version` or `static
if`. It's making it hard to maintain a single code base that compiles on GDC,
LDC, and DMD without modifications.