remove FIXME(rust-lang#11094) and allow make tests to run on targets besides host

Author: nivkner

src/tools/compiletest/src/runtest.rs

@@ -2358,11 +2358,6 @@ impl<'test> TestCx<'test> {
     }
 
     fn run_rmake_test(&self) {
-        // FIXME(#11094): we should fix these tests
-        if self.config.host != self.config.target {
-            return;
-        }
-
         let cwd = env::current_dir().unwrap();
         let src_root = self.config
             .src_base