mingw-w64: legacy_stdio_definitions.lib does not exist

[1480c1]

this library doesn't exist with mingw-w64 as far as I can tell, and causes a linking error:

/mingw32/bin/../lib/gcc/i686-w64-mingw32/13.2.0/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -llegacy_stdio_definitions: No such file or directory

[wantehchang]

@fdintino @vrabaud Could you take a look at this?

The reference to legacy_stdio_definitions.lib comes from #1579.

[fdintino]

It looks like rustc default links to all of those libraries, so I was wrong to pull it from the pkgconfig file. I'll reconfirm the symbols in the windows build of rav1e.

[fdintino]

And actually it looks like legacy_stdio_definitions.lib was removed recently, in rust-lang/libc#3226. So at the very least we can safely remove it from this list, notwithstanding the other libraries.