remove floats dir and update cargo.toml

Author: xonx4l

library/std/Cargo.toml

@@ -150,10 +150,6 @@ harness = false
 name = "sync"
 path = "tests/sync/lib.rs"
 
-[[test]]
-name = "floats"
-path = "tests/floats/lib.rs"
-
 [[test]]
 name = "thread_local"
 path = "tests/thread_local/lib.rs"