mesg: move uu_app() to bottom of file

Author: cakebaker

src/uu/mesg/src/mesg.rs

@@ -68,6 +68,17 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     Ok(())
 }
 
+#[cfg(not(target_family = "unix"))]
+#[uucore::main]
+pub fn uumain(args: impl uucore::Args) -> UResult<()> {
+    let _matches: ArgMatches = uu_app().try_get_matches_from(args)?;
+
+    Err(uucore::error::USimpleError::new(
+        1,
+        "`mesg` is available only on Unix platforms.",
+    ))
+}
+
 pub fn uu_app() -> Command {
     Command::new(uucore::util_name())
         .version(crate_version!())
@@ -88,14 +99,3 @@ pub fn uu_app() -> Command {
                 .action(ArgAction::Set),
         )
 }
-
-#[cfg(not(target_family = "unix"))]
-#[uucore::main]
-pub fn uumain(args: impl uucore::Args) -> UResult<()> {
-    let _matches: ArgMatches = uu_app().try_get_matches_from(args)?;
-
-    Err(uucore::error::USimpleError::new(
-        1,
-        "`mesg` is available only on Unix platforms.",
-    ))
-}