Wire.cpp optimistic_yield() Bug in Staging

[toddtreece]

I'm using the staging package to test against right now because it has some fixes I need, and I ran into this new bug with the Wire lib:

/home/travis/.arduino15/packages/esp8266/hardware/esp8266/1.6.5-939-g033463a/libraries/Wire/Wire.cpp: In member function 'virtual int TwoWire::available()':
/home/travis/.arduino15/packages/esp8266/hardware/esp8266/1.6.5-939-g033463a/libraries/Wire/Wire.cpp:167:26: error: too few arguments to function 'void optimistic_yield(uint32_t)'
         optimistic_yield();
                          ^
In file included from /home/travis/.arduino15/packages/esp8266/hardware/esp8266/1.6.5-939-g033463a/cores/esp8266/twi.h:23:0,
                 from /home/travis/.arduino15/packages/esp8266/hardware/esp8266/1.6.5-939-g033463a/libraries/Wire/Wire.cpp:30:
/home/travis/.arduino15/packages/esp8266/hardware/esp8266/1.6.5-939-g033463a/cores/esp8266/Arduino.h:208:6: note: declared here
 void optimistic_yield(uint32_t interval_us);

Travis CI build log with more details: https://travis-ci.org/adafruit/adafruit-io-basics#L591