The idea is that if you have a `typedef Uint32 MyFlags` that has a bunch of
defines that are meant to be bitflags, you can pack them into the same wiki
page automatically.
This only works with `typedef`s that are _not_ struct/union/enums, and it
only pulls in `#define` lines that immediately follow the typedef line.
Even a blank line or a comment will signal to stop including lines for
this page!