apt-pkg/cdrom.{cc,h}: add (ugly) workaround to ensure the ABI is not broken (also in this case its probably not needed because pkgUDevCDrom is not used outside libapt itself, still its better to be on the save side)

apt-pkg/cdrom.cc

@@ -854,7 +854,9 @@ pkgUdevCdromDevices::Dlopen()                     		        /*{{{*/
    libudev_handle = h;
    udev_new = (udev* (*)(void)) dlsym(h, "udev_new");
    udev_enumerate_add_match_property = (int (*)(udev_enumerate*, const char*, const char*))dlsym(h, "udev_enumerate_add_match_property");
+#if 0 // FIXME: uncomment on next ABI break
    udev_enumerate_add_match_sysattr = (int (*)(udev_enumerate*, const char*, const char*))dlsym(h, "udev_enumerate_add_match_sysattr");
+#endif
    udev_enumerate_scan_devices = (int (*)(udev_enumerate*))dlsym(h, "udev_enumerate_scan_devices");
    udev_enumerate_get_list_entry = (udev_list_entry* (*)(udev_enumerate*))dlsym(h, "udev_enumerate_get_list_entry");
    udev_device_new_from_syspath = (udev_device* (*)(udev*, const char*))dlsym(h, "udev_device_new_from_syspath");
@@ -895,8 +897,13 @@ pkgUdevCdromDevices::ScanForRemovable(bool CdromOnly)
    enumerate = udev_enumerate_new (udev_ctx);
    if (CdromOnly)
       udev_enumerate_add_match_property(enumerate, "ID_CDROM", "1");
-   else
+   else {
+#if 1 // FIXME: remove the next two lines on the next ABI break
+      int (*udev_enumerate_add_match_sysattr)(struct udev_enumerate *udev_enumerate, const char *property, const char *value);
+      udev_enumerate_add_match_sysattr = (int (*)(udev_enumerate*, const char*, const char*))dlsym(libudev_handle, "udev_enumerate_add_match_sysattr");
+#endif
       udev_enumerate_add_match_sysattr(enumerate, "removable", "1");
+   }
 
    udev_enumerate_scan_devices (enumerate);
    devices = udev_enumerate_get_list_entry (enumerate);

apt-pkg/cdrom.h

@@ -92,7 +92,9 @@ class pkgUdevCdromDevices						/*{{{*/
    struct udev_enumerate *(*udev_enumerate_new) (struct udev *udev);
    struct udev_list_entry *(*udev_list_entry_get_next)(struct udev_list_entry *list_entry);
    const char* (*udev_device_get_property_value)(struct udev_device *udev_device, const char *key);
+#if 0 // FIXME: uncomment on next ABI break
    int (*udev_enumerate_add_match_sysattr)(struct udev_enumerate *udev_enumerate, const char *property, const char *value);
+#endif 
    // end libudev dlopen
    
  public: