v0.18.58-opencv-fix: Revert the pkg-config changes from commit f6f0965

Revert the pkg-config changes from commit f6f096561f0e09b4c85e4049a4e…

…b7948ad24d7eb (https://github.com/ruslo/hunter/commit/f6f096561f0e09b4c85e4049a4eb7948ad24d7eb)