Part 1 of 2: <http://webkit.org/b/59838> Implement HTTP pipelining for CoreFoundation...

Part 1 of 2: <webkit.org/b/59838> Implement HTTP pipelining for CoreFoundation-based networking
<rdar://problem/8924448>

Reviewed by Adam Roben.

* win/include/WebKitSystemInterface/WebKitSystemInterface.h:
(wkGetHTTPPipeliningPriority): Added declaration.
(wkSetHTTPPipeliningMaximumPriority): Added declaration.
(wkSetHTTPPipeliningPriority): Added declaration.
* win/lib/WebKitSystemInterface.lib: Updated.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@85611 268f45cc-cd09-0410-ab3c-d52691b4dbfc