Remove explicit linkage include in tests to fix the ci test.

[TheVeryDarkness]

I guess brotli has already been a static library so we don't need that.

Tested on both macOS and Windows. I'm wondering why this line was added.

[pkgw]

The point of the line is to try to make sure that library dependencies are listed in the correct order when they're passed to the linker. If you're linking with static libraries, the order in which they're specified matters — if I'm linking an executable that depends on liba.a and libb.a, and liba.a depends on libb.a, the link will fail if I mention them as libb.a liba.a on the command line. vcpkg-rs used to not always do that correctly.

Anyway, it seems that this is no longer an issue here, so let's drop it!

[TheVeryDarkness]

Thanks for your answering :)