cmake PThreads4W examples

vectorgraphics/asymptote cmake-scripts/external-libs.cmake :139 

find_package(PThreads4W)

mltframework/mlt CMakeLists.txt :184 

find_package(PThreads4W REQUIRED)

SWI-Prolog/swipl-devel CMakeLists.txt :218 

find_package(PThreads4W)