Fix the iOS build

Patch by Benjamin Poulain <bpoulain@apple.com> on 2014-10-24

Source/WebKit/mac:

* Configurations/WebKitLegacy.xcconfig:
* WebView/WebView.mm:

Source/WebKit2:

* Configurations/WebKit.xcconfig:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@175196 268f45cc-cd09-0410-ab3c-d52691b4dbfc