Use psxcdgen_ex under WSL and improve wslpath and makefiles

src/Tools/wslpath/src/lib.rs

@@ -6,6 +6,7 @@ fn convert_slashes(path: String) -> String {
     path.replace('\\', "/")
 }
 
+#[cfg(target_os = "windows")]
 fn replace_drive_letter(mut path: String) -> String {
     let has_drive_letter = {
         let drive_letter = path.get(0..2);
@@ -35,5 +36,10 @@ fn replace_drive_letter(mut path: String) -> String {
         path.insert_str(0, "/mnt/");
     }
 
+    path
+}
+
+#[cfg(not(target_os = "windows"))]
+fn replace_drive_letter(path: String) -> String {
     path
 }