Remove Mac libc++ mkspecs

Should not be needed anymore (as of 3d0a60aaa4077a8), as we now use libc++
automatically when C++11 support is enabled.

The specs were deprecated in Qt 5.1 (commit f7a7859a7).

Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Change-Id: I6653f191b99f7c51c3f02a62c6ef68591b2dfa70
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
macx-xcode: Use Info.plist templates from original makespec

Change-Id: I178f1ce7cea1228d3d38b3517f9dcecc3c2d4c6f
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Andy Shaw <andy.shaw@digia.com>
iOS: Get rid of QIOSMainWrapperApplicationDelegate

We only control the application delegate in the wrapped case anyways,
so QIOSApplicationDelegate is good enough for our use.

Change-Id: Ib738592dc306c5b6652632b9ae4dab431639a89a
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>