fix gix-command tests on windows

It seems windows now has a windows-unspecific `echo` program
and one can't really rely on it producing windows style newlines.

Now we use printf which is more standard and can be used to validate
multiple arguments as well.

gix-command/tests/command.rs

@@ -82,32 +82,26 @@ mod spawn {
 
         #[test]
         fn sh_shell_specific_script_code_with_single_extra_arg() -> crate::Result {
-            let out = gix_command::prepare("echo")
+            let out = gix_command::prepare("printf")
                 .with_shell()
                 .arg("1")
                 .spawn()?
                 .wait_with_output()?;
             assert!(out.status.success());
-            #[cfg(not(windows))]
-            assert_eq!(out.stdout.as_bstr(), "1\n");
-            #[cfg(windows)]
-            assert_eq!(out.stdout.as_bstr(), "1\r\n");
+            assert_eq!(out.stdout.as_bstr(), "1");
             Ok(())
         }
 
         #[test]
         fn sh_shell_specific_script_code_with_multiple_extra_args() -> crate::Result {
-            let out = gix_command::prepare("echo")
+            let out = gix_command::prepare("printf")
                 .with_shell()
-                .arg("1")
-                .arg("2")
+                .arg("%s")
+                .arg("arg")
                 .spawn()?
                 .wait_with_output()?;
             assert!(out.status.success());
-            #[cfg(not(windows))]
-            assert_eq!(out.stdout.as_bstr(), "1 2\n");
-            #[cfg(windows)]
-            assert_eq!(out.stdout.as_bstr(), "1 2\r\n");
+            assert_eq!(out.stdout.as_bstr(), "arg");
             Ok(())
         }
     }