CDImageDevice: Implement disc reading for Linux

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

CMakeModules/DuckStationDependencies.cmake

@@ -7,6 +7,9 @@ if(NOT WIN32 AND NOT ANDROID)
 	find_package(WebP REQUIRED)
   find_package(ZLIB REQUIRED)
 endif()
+if(LINUX AND NOT ANDROID)
+  find_package(UDEV REQUIRED)
+endif()
 if(UNIX AND NOT APPLE)
   find_package(Libbacktrace)
   if(NOT LIBBACKTRACE_FOUND)

CMakeModules/FindUDEV.cmake

@@ -0,0 +1,32 @@
+# - Try to find UDEV
+# Once done, this will define
+#
+#  UDEV_FOUND - system has UDEV
+#  UDEV_INCLUDE_DIRS - the UDEV include directories
+#  UDEV_LIBRARIES - the UDEV library
+find_package(PkgConfig)
+
+pkg_check_modules(UDEV_PKGCONF libudev)
+
+find_path(UDEV_INCLUDE_DIRS
+  NAMES libudev.h
+  PATHS ${UDEV_PKGCONF_INCLUDE_DIRS}
+)
+
+find_library(UDEV_LIBRARIES
+  NAMES udev
+  PATHS ${UDEV_PKGCONF_LIBRARY_DIRS}
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(UDEV DEFAULT_MSG UDEV_INCLUDE_DIRS UDEV_LIBRARIES)
+
+mark_as_advanced(UDEV_INCLUDE_DIRS UDEV_LIBRARIES)
+
+if(UDEV_FOUND AND NOT (TARGET UDEV::UDEV))
+  add_library (UDEV::UDEV UNKNOWN IMPORTED)
+  set_target_properties(UDEV::UDEV
+    PROPERTIES
+    IMPORTED_LOCATION ${UDEV_LIBRARIES}
+    INTERFACE_INCLUDE_DIRECTORIES ${UDEV_INCLUDE_DIRS})
+endif()