[EFL][WK2] Skip failing EFL API tests
https://bugs.webkit.org/show_bug.cgi?id=133981

Reviewed by Csaba Osztrogonác.

UserMessage, WillLoad and test_ewk2_view have been failed since r169784.

Source/WebKit2:
* PlatformEfl.cmake:

Tools:
* TestWebKitAPI/PlatformEfl.cmake:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@170054 268f45cc-cd09-0410-ab3c-d52691b4dbfc