cmake SNMALLOC_HAS_LINUX_RANDOM_H examples

Jackarain/proxy third_party/snmalloc/CMakeLists.txt :130 

CHECK_INCLUDE_FILE_CXX(linux/random.h SNMALLOC_HAS_LINUX_RANDOM_H)

CTSRD-CHERI/cheribsd contrib/subrepo-snmalloc/CMakeLists.txt :126 

CHECK_INCLUDE_FILE_CXX(linux/random.h SNMALLOC_HAS_LINUX_RANDOM_H)