Move src/math/floorf.rs -> src/musl/floorf.rs

Author: tesuji

src/musl.rs

@@ -0,0 +1,3 @@
+mod floorf;
+
+pub use self::floorf::floorf;

src/math/floorf.rs renamed to src/musl/floorf.rs

@@ -1,6 +1,6 @@
 use core::f32;
 
-/// Floor (f64)
+/// Floor (f32)
 ///
 /// Finds the nearest integer less than or equal to `x`.
 #[inline]