remove GMimeHeader struct, it's not public
remove GMimeHeader struct, it's not public

svn path=/trunk/; revision=1392

zsx/gmime,GNOME/gmime,zsx/gmime,GNOME/gmime,zsx/gmime,jstedfast/gmime,jstedfast/gmime,GNOME/gmime,jstedfast/gmime,zsx/gmime