Fixed changed compile-fail messages

Author: korken89

cortex-m-rt/tests/compile-fail/exception-soundness.rs

@@ -25,5 +25,5 @@ fn SysTick() {
 #[exception]
 fn SVCall() {
     // If this was allowed it would lead to a data race as `SVCall` could preempt `SysTick`
-    SysTick(); //~ ERROR cannot find function `SysTick` in this scope
+    SysTick(); //~ ERROR cannot find function, tuple struct or tuple variant `SysTick` in this scope [E0425]
 }

cortex-m-rt/tests/compile-fail/interrupt-soundness.rs

@@ -30,5 +30,5 @@ fn USART1() {
 
 #[interrupt]
 fn USART2() {
-    USART1(); //~ ERROR cannot find function `USART1` in this scope
+    USART1(); //~ ERROR cannot find function, tuple struct or tuple variant `USART1` in this scope [E0425]
 }