cmake HAVE_CLEARENV examples

lopter/lightsd CMakeScripts/CompatSetProctitle.cmake :4 

ADD_DEFINITIONS("-DHAVE_CLEARENV=1")

lopter/lightsd CMakeScripts/CompatSetProctitle.cmake :41 

CHECK_FUNCTION_EXISTS("clearenv" HAVE_CLEARENV)

lopter/lightsd CMakeScripts/CompatSetProctitle.cmake :48 

ADD_DEFINITIONS("-DHAVE_CLEARENV=1")