libtiff: file libport.h was added on branch branch-3-9 on 2009-11-02 14:47:41 +0000

https://github.com/libsdl-org/libtiff/commit/aada7e2deab4c5f1964ace865fec858311e21dcf

[Couldn't obtain the patch due to network issues; please check the above link instead.]