cmake HAVE_DECL_MADVISE examples

arkdb/inception configure.cmake :559 

CHECK_SYMBOL_EXISTS(madvise "sys/mman.h" HAVE_DECL_MADVISE)

alibaba/AliSQL configure.cmake :666 

CHECK_SYMBOL_EXISTS(madvise "sys/mman.h" HAVE_DECL_MADVISE)

Tokutek/mysql-5.5 configure.cmake :483 

CHECK_SYMBOL_EXISTS(madvise "sys/mman.h" HAVE_DECL_MADVISE)