cmake: set CMAKE_PREFIX_PATH
This tells CMake where to find dependencies, important for find modules that don't use pkg-config.
See discussion at: https://bugs.webkit.org/show_bug.cgi?id=197934#c9
Edited by Christoph Reiter
This tells CMake where to find dependencies, important for find modules that don't use pkg-config.
See discussion at: https://bugs.webkit.org/show_bug.cgi?id=197934#c9