Remove curlbuild include
Remove curlbuild include

Curl removed that header in 73a2fcea0b4adea6ba342cd7ed1149782c214ae3
([1])
http.cpp doesn't use anything from that header and compilation works for
fine with curl 7.54.1

Fixes #647
Ref:
[1]: https://github.com/curl/curl/commit/73a2fcea0b4adea6ba342cd7ed1149782c214ae3

jaagr/polybar,jaagr/lemonbuddy,jaagr/polybar,jaagr/lemonbuddy,jaagr/lemonbuddy,jaagr/polybar