FindTIFF: consider `IMPLIB`-using platforms

Support multi-config-providing and `IMPLIB`-using deployments with the
`tiff-config` trampoline code. Follow the pattern used in `FindFreetype`
by commit ae9890cd36 (FindFreeType: consider `IMPLIB`-using platforms,
2023-10-26, v3.28.0-rc4~10^2~3).

See: #25485