save the old errno of the sendfile() call in case that the attr_get() fails in stat-cache-get-entry 
save the old errno of the sendfile() call in case that the attr_get()
fails in stat-cache-get-entry 


git-svn-id: c4e9838fefcfae554524937a357000afc2bbf25b@1386 152afb58-edef-0310-8abb-c4023f1b3aa9

ctdk/lighttpd-1.4.x,ctdk/lighttpd-1.4.x,ctdk/lighttpd-1.4.x,ctdk/lighttpd-1.4.x