Merge pull request #601 from Patryk27/fix_avr_floats

fix: Add `#[avr_skip]` for `__addsf3` & `__adddf3`

Author: Amanieu

Diff for: src/float/add.rs

@@ -189,12 +189,14 @@ where
 }
 
 intrinsics! {
+    #[avr_skip]
     #[aapcs_on_arm]
     #[arm_aeabi_alias = __aeabi_fadd]
     pub extern "C" fn __addsf3(a: f32, b: f32) -> f32 {
         add(a, b)
     }
 
+    #[avr_skip]
     #[aapcs_on_arm]
     #[arm_aeabi_alias = __aeabi_dadd]
     pub extern "C" fn __adddf3(a: f64, b: f64) -> f64 {