cmake HAVE_SENDFILE examples

esbmc/esbmc scripts/cmake/SendFileHack.cmake :5 

CHECK_SYMBOL_EXISTS(sendfile /usr/include/sys/sendfile.h HAVE_SENDFILE)

christianparpart/x0 CMakeLists.txt :93 

CHECK_FUNCTION_EXISTS(sendfile HAVE_SENDFILE)

xrootd/xrootd cmake/XRootDSystemCheck.cmake :79 

check_function_exists( sendfile HAVE_SENDFILE )