Add missing license and inline anotations

src/math.rs

@@ -1,18 +1,24 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#[inline]
 pub(crate) fn f32_trunc(val: f32) -> f32 {
     #[cfg(feature = "std")]
     { val.round() }
     #[cfg(not(feature = "std"))]
     { libm::roundf(val) }
 }
 
+#[inline]
 pub(crate) fn f32_round(val: f32) -> f32 {
     #[cfg(feature = "std")]
     { val.round() }
     #[cfg(not(feature = "std"))]
     { libm::roundf(val) }
 }
 
+#[inline]
 pub(crate) fn f64_pow(a: f64, b: f64) -> f64 {
     #[cfg(feature = "std")]
     { f64::powf(a, b) }