graphics/dcmtk: Link with shared version of libtiff and add USES= pathfix

Port defines (lib)tiff as dependency using the shared library and also
refers to it in .pc file as a shared however dcmimage/libsrc compiles
using the static library. Adjust upstream code to link with the
shared library instead. While at it add USES= pathfix to fix warning
about location of installed .pc file.

PR: 281640
Reviewed by: yuri