Handle EINTR returned from apr_pollset_poll when a user suspends and then backgrounds the applications.
Handle EINTR returned from apr_pollset_poll when a user suspends and then
backgrounds the applications.

* context.c
  (serf_context_run): Treat APR_EINTR as APR_SUCCESS, so that the application
   will rerun the context.

KyleSanderson/serf,yesoce/serf,x-clone/serf,yesoce/serf,lazysoez/serf,zhupan/serf,yesoce/serf,pengdu/serf,x-clone/serf,google-code-export/serf,soufianeEL/serf,soufianeEL/serf,zhengcq315/serf,google-code-export/serf,alex1818/serf,zhupan/serf,zhupan/serf,SirJson/serf,lazysoez/serf,KyleSanderson/serf,stoneCC/serf,SirJson/serf,zhengcq315/serf,lazysoez/serf,zhengcq315/serf,google-code-export/serf,zhupan/serf,stoneCC/serf,x-clone/serf,pengdu/serf,google-code-export/serf,soufianeEL/serf,zhengcq315/serf,pengdu/serf,SirJson/serf,stoneCC/serf,SirJson/serf,yesoce/serf,alex1818/serf,stoneCC/serf,KyleSanderson/serf,alex1818/serf,KyleSanderson/serf,alex1818/serf,lazysoez/serf,x-clone/serf,pengdu/serf,soufianeEL/serf