cmake HAVE_SYSENT_H examples

arkdb/inception configure.cmake :270 

CHECK_INCLUDE_FILES (sysent.h HAVE_SYSENT_H)

alibaba/AliSQL configure.cmake :375 

CHECK_INCLUDE_FILES (sysent.h HAVE_SYSENT_H)

Tokutek/mysql-5.5 configure.cmake :219 

CHECK_INCLUDE_FILES (sysent.h HAVE_SYSENT_H)