CDImageDevice: Implement disc reading for Linux

And fix it for Windows. SubQ reading should now work.

src/util/CMakeLists.txt

@@ -276,6 +276,10 @@ elseif(NOT ANDROID)
   pkg_check_modules(DBUS REQUIRED dbus-1)
   target_include_directories(util PRIVATE ${DBUS_INCLUDE_DIRS})
   target_link_libraries(util PRIVATE ${DBUS_LINK_LIBRARIES})
+
+  if(LINUX)
+    target_link_libraries(util PRIVATE UDEV::UDEV)
+  endif()
 endif()
 
 if(NOT WIN32 AND NOT ANDROID)

src/util/cd_image.cpp

@@ -61,14 +61,21 @@ std::unique_ptr<CDImage> CDImage::Open(const char* filename, bool allow_patches,
   extension = std::strrchr(filename, '.');
 #endif
 
+  std::unique_ptr<CDImage> image;
   if (!extension)
   {
-    Log_ErrorPrintf("Invalid filename: '%s'", filename);
-    return nullptr;
+    // Device filenames on Linux don't have extensions.
+    if (IsDeviceName(filename))
+    {
+      image = OpenDeviceImage(filename, error);
+    }
+    else
+    {
+      Log_ErrorPrintf("Invalid filename: '%s'", filename);
+      return nullptr;
+    }
   }
-
-  std::unique_ptr<CDImage> image;
-  if (StringUtil::Strcasecmp(extension, ".cue") == 0)
+  else if (StringUtil::Strcasecmp(extension, ".cue") == 0)
   {
     image = OpenCueSheetImage(filename, error);
   }