[Curl] Enable file logging.
https://bugs.webkit.org/show_bug.cgi?id=135202

Patch by peavo@outlook.com <peavo@outlook.com> on 2014-07-24
Reviewed by Alex Christensen.

The Curl api offers the possibility to write log messages to file. Enable this for debugging purposes.

* platform/network/curl/ResourceHandleManager.cpp:
(WebCore::ResourceHandleManager::ResourceHandleManager):
(WebCore::ResourceHandleManager::~ResourceHandleManager):
(WebCore::ResourceHandleManager::initializeHandle):
* platform/network/curl/ResourceHandleManager.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@171513 268f45cc-cd09-0410-ab3c-d52691b4dbfc