[EFL] Disable GLOBAL_FAST_MALLOC_NEW by default.
https://bugs.webkit.org/show_bug.cgi?id=114031

Reviewed by Alexis Menard.

Follow what some other ports already do and avoid globally overriding
the `new' and `delete' operators with the ones in FastMalloc.

In many cases, third-party or client code allocates memory with
standard library calls but the memory gets deleted by FastMalloc,
causing a crash. The reverse (ie. memory being allocated by FastMalloc
and freed by the system libraries) is also possible.

Commits 135666 and 121018 provide more information about this, as well
as comment 6 in bug 89358.

* wtf/Platform.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147743 268f45cc-cd09-0410-ab3c-d52691b4dbfc