Log Message:
Update sylpheed to 0.8.7.
Changes are:
* 0.8.7

    * The extended regular expression has been supported on filtering.
    * The option to resize images to fit the size of view has been added.
    * The previous account is now restored on reediting draft messages.
    * The routine of MIME header encoding has been rewritten completely,
      and Q-encoding for single-byte locales has been also implemented.
    * Strings beginning with "www." are now treated as URI.
    * The default WWW browser has been changed to Mozilla.
    * The common preferences dialog has been reorganized a bit.
    * The remote command operation can be executed without X now.
    * Code cleanups for the implementation of SMTP has been made.
    * Autotools and libtool have been updated.
    * A fix for font loading problem has been made.
    * Other minor bugfixes have been made.

For the complete list see ChangeLog.