Revert "SuperBuild: shark: allow extra user option to link with pthread"
Revert "SuperBuild: shark: allow extra user option to link with pthread"

This reverts commit d25245e88711a3c357cebbb8ea942b5c3c35aefb.

orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB