http.c :修改函数顺序以顺利编译。
CMakeLists.txt: 增加cygwin支持
Merge branch 'master' of https://github.com/xiehuc/lwqq into cygwin

Conflicts:
	lib/http.c
Merge pull request #2 from btbxbob/cygwin

http.c :修改函数顺序以顺利编译。