[email protected]: update test

Author: cho-m

Formula/g/[email protected]

@@ -78,7 +78,7 @@ def install
 
     # Try running a sample using cgo without CC or CXX set to ensure that the
     # toolchain's default choice of compilers work
-    with_env(CC: nil, CXX: nil) do
+    with_env(CC: nil, CXX: nil, CGO_ENABLED: "1") do
       assert_equal "Hello from cgo!\n", shell_output("#{bin}/go run hello_cgo.go")
     end
   end