Update ruby-eventmachine to 1.0.9.1.

# Changelog

## 1.0.9.1 (January 14, 2016)
* Fix EPROTO not defined on Windows [#676]
* Fix missing cast to struct sockaddr * [#671]
* Fix bug in OpenSSL path detection [#675]

## 1.0.9 (January 13, 2016)
* Try more ways to detect OpenSSL [#602, #643, #661, #663, #668, #669]
* Use WSAGetLastError in pipe.cpp same as ed.cpp [#659]
* Test compiler flags with the C++ compiler and add them to CXXFLAGS [#634, #651]
* Restore silent-fail on unsupported EM.epoll and EM.kqueue [#638, #649]
* getDescriptorByFileno deprecated in JRuby 1.7.x, removed in JRuby 9000 [#642, #648]
* Add -Wno-address always-true because on Windows rb_fd_select [#578]
* Remove the WITHOUT_SSL constant [#578]
* Fix SSL error when the server replies a TLS Alert to our ClientHello [#544, #653]
* Use WSAStringToAddress in lieu of inet_pton for IPv6 address detection on Windows [#595, #632]
* Fix nasty TCP/IPv6 bug [#595, #632]
* Use select_large_fdset on Solaris [#611, #625]
* Detect the Solaris Studio compiler [#611, #625]
* Throw a message with strerror included [#136, #621]

(taca)