Added 4 new methods:

    Added 4 new methods:
        wkSetClientCertificateInSSLProperties,
        wkCanAccessCFURLRequestHTTPBodyParts,
        wkCFURLRequestCopyHTTPRequestBodyParts,
        wkCFURLRequestSetHTTPRequestBodyParts

        Rubber-stamped by Steve.

        * win/include/WebKitSystemInterface/WebKitSystemInterface.h:
        * win/lib/WebKitSystemInterface.lib:
        * win/lib/WebKitSystemInterface_debug.lib:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@30084 268f45cc-cd09-0410-ab3c-d52691b4dbfc