Fix function name to printf

Function could not be found and triggered an error message.

gcc/testsuite/ChangeLog:

	* rust/compile/feature_rust_attri0.rs: Add extern
	function declaration and change name to printf.
	* rust/compile/nr2/exclude: Remove now passing test from exclusion
	list.

Signed-off-by: Pierre-Emmanuel Patry <[email protected]>

Author: P-E-P

gcc/testsuite/rust/compile/feature_rust_attri0.rs

@@ -1,11 +1,15 @@
+extern "C" {
+    fn printf(s: *const i8, ...);
+}
+
 #[rustc_builtin_macro] //{ dg-error "internal implementation detail. " "" { target *-*-* }  }
 macro_rules! line {
     () => {{}};
 }
 
 fn main() -> i32 {
     let a = line!();
-    print(a);
+    printf("%d\0" as *const str as *const i8, a);
 
     0
 }

gcc/testsuite/rust/compile/nr2/exclude

@@ -1,7 +1,6 @@
 canonical_paths1.rs
 cfg1.rs
 const_generics_3.rs
-feature_rust_attri0.rs
 generics9.rs
 issue-1901.rs
 issue-1981.rs