Ios: Move tools to <libexec>/ios, make them lowercase, fix deployment

They can't be directly in libexec path, because then they couldn't have
their own qt.conf for resolving the Cocoa platform plugin.

Change-Id: I8f3fae85c548747a7d826c078c7ac1fb0a836b43
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>