Remove curl_fetch_web_data\header_callback
Remove curl_fetch_web_data\header_callback

This private method was not used anywhere and had unused parameters (of whom nobody knows what it should've done so clearly this function wasn't understood).

Signed-off-by: Yoshi2889 <77953cd64cc4736aae27fa116356e02d2d97f7ce@gmail.com>

StealthWombat/SMF2.1-more-forkery,StealthWombat/SMF2.1-more-forkery