[certi-dev] Found a mistake about tokens.cc generated by lex

[YangJing]

Hi,after I load the Certi.sln and command to build solution ,tokens.cc will be 
generated at the first time.In the file will include unistd.h after #ifdef 
__cplusplus .this file is available in windows system.I look through the input 
file tokens.ll and wand to modify or add #ifndef WIN32 to fix the mistake but 
failed.
How to fit it any then?
The same problem happens in some other source files,and can be fixed easily.But 
this ONE looks very stubborn.
I know nothing about flex,God save me!
YangJing