www/surf: Update to 2.0

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Notable changes since 0.7:

• Switch to webkit2-gtk3
• Remove proxy stuff, it's now handled by WebView
• Scrolling, SSL policy, Disk Cache, and Cookies are now handled through WebKit

Changes: http://git.suckless.org/surf/log/?qt=range&q=0.7..2.0
PR: 221548
Submitted by: Dmitri Goutnik <dg@syrec.org>