cmake HAVE_PROC_PIDPATH examples

Froser/gamemachine src/3rdparty/openal-soft-1.19.1/CMakeLists.txt :554

CHECK_SYMBOL_EXISTS(proc_pidpath     libproc.h HAVE_PROC_PIDPATH)

axmolengine/axmol 3rdparty/openal/CMakeLists.txt :573

check_symbol_exists(proc_pidpath     libproc.h HAVE_PROC_PIDPATH)

glKarin/com.n0n3m4.diii4a Q3E/src/main/jni/doom3/neo/externlibs/openal-soft/CMakeLists.txt :552

check_symbol_exists(proc_pidpath     libproc.h HAVE_PROC_PIDPATH)

kcat/openal-soft CMakeLists.txt :625

check_symbol_exists(proc_pidpath     libproc.h HAVE_PROC_PIDPATH)