disable import for non linux test

Signed-off-by: bg-furiosa <[email protected]>

device-api/src/proc.rs

@@ -99,7 +99,9 @@ fn read_cmdline(pid: u32) -> Option<String> {
 
 #[cfg(test)]
 mod tests {
-    #[test]
+    #[cfg(target_os = "linux")]
+    use super::*;
+
     #[cfg(target_os = "linux")]
     fn read_cmdline_test() {
         let my_pid = std::process::id();