Add .stderr file for test that appears to trigger a lint that cannot be silenced.

Author: pnkfelix

src/test/ui/run-pass/packed/packed-struct-generic-size.stderr

@@ -0,0 +1,36 @@
+warning: unnecessary path disambiguator
+  --> $DIR/packed-struct-generic-size.rs:48:14
+   |
+LL |     check!(P1::<u8, u8>, 1, 3);
+   |              ^^ try removing `::`
+
+warning: unnecessary path disambiguator
+  --> $DIR/packed-struct-generic-size.rs:49:14
+   |
+LL |     check!(P1::<u64, u16>, 1, 11);
+   |              ^^ try removing `::`
+
+warning: unnecessary path disambiguator
+  --> $DIR/packed-struct-generic-size.rs:51:14
+   |
+LL |     check!(P2::<u8, u8>, 1, 3);
+   |              ^^ try removing `::`
+
+warning: unnecessary path disambiguator
+  --> $DIR/packed-struct-generic-size.rs:52:14
+   |
+LL |     check!(P2::<u64, u16>, 2, 12);
+   |              ^^ try removing `::`
+
+warning: unnecessary path disambiguator
+  --> $DIR/packed-struct-generic-size.rs:54:15
+   |
+LL |     check!(P4C::<u8, u8>, 1, 3);
+   |               ^^ try removing `::`
+
+warning: unnecessary path disambiguator
+  --> $DIR/packed-struct-generic-size.rs:55:15
+   |
+LL |     check!(P4C::<u16, u64>, 4, 12);
+   |               ^^ try removing `::`
+