Make patterns_in_fns_without_body warn-by-default again

Fix some tests on Linux

src/librustc/lint/builtin.rs

@@ -163,7 +163,7 @@ declare_lint! {
 
 declare_lint! {
     pub PATTERNS_IN_FNS_WITHOUT_BODY,
-    Deny,
+    Warn,
     "patterns in functions without body were erroneously allowed"
 }
 

src/test/compile-fail/no-patterns-in-args-2.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![deny(patterns_in_fns_without_body)]
+
 trait Tr {
     fn f1(mut arg: u8); //~ ERROR patterns aren't allowed in methods without bodies
                         //~^ WARN was previously accepted

src/test/run-pass/linkage1.rs

@@ -32,7 +32,9 @@ fn main() {
     // discarded. By adding and calling `other::bar`, we get around this problem.
     other::bar();
 
-    assert!(!foo.is_null());
-    assert_eq!(unsafe { *foo }, 3);
-    assert!(something_that_should_never_exist.is_null());
+    unsafe {
+        assert!(!foo.is_null());
+        assert_eq!(*foo, 3);
+        assert!(something_that_should_never_exist.is_null());
+    }
 }

src/test/run-pass/thread-local-extern-static.rs

@@ -22,5 +22,7 @@ extern {
 }
 
 fn main() {
-    assert_eq!(FOO, 3);
+    unsafe {
+        assert_eq!(FOO, 3);
+    }
 }