libev error handling

[Georgy Kirichenko]

Hi!

We use libev in our project (tarantool.org) and a problem with how libev 
handles its internal errors.
Periodically we need to create a new thread with libev pool and async. But in 
some cases process can haven't enough file descriptors to create pipe in 
evpipe_init (called by ev_async_start). In case of error libev will call 
ev_syscall and return to pipe creation. 
ev_syscall can abort process (this is unacceptable for us) or can callback if 
installed. But installed callback can't do nothing to break evpipe_init loop.

To fix this i create a patch, that allow early descriptors initialization at 
ev_loop_new, that can return NULL in case of errors. 
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