Remove find_program tests

We need to move this tests to live inside the module since the
`find_program` fn is a private implementation.

Signed-off-by: Salim Afiune <[email protected]>

Author: Salim Afiune

src/libstd/sys/windows/process.rs

@@ -112,9 +112,6 @@ impl Command {
     pub fn env_clear(&mut self) {
         self.env = Some(HashMap::new())
     }
-    pub fn with_env(&mut self, env: &HashMap<OsString, OsString>) {
-        self.env = Some(env)
-    }
     pub fn cwd(&mut self, dir: &OsStr) {
         self.cwd = Some(dir.to_os_string())
     }

src/test/run-pass/process_command/find_program.rs

@@ -0,0 +1,3 @@
+@ECHO OFF
+SET foo=bar
+ECHO testing %foo%