Add test for multiple wildcard use declaration.

gcc/testsuite/ChangeLog:

	* rust/compile/import_wildcards.rs: New test.

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

Author: P-E-P

gcc/testsuite/rust/compile/import_wildcards.rs

@@ -0,0 +1,8 @@
+mod x {}
+
+mod y {}
+
+fn main() {
+    use x as _;
+    use y as _;
+}