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>

src/plugins/ios/iosconfigurations.h

@@ -64,7 +64,6 @@ public:
     static IosConfigurations &instance();
     IosConfig config() const { return m_config; }
     void setConfig(const IosConfig &config);
-    Utils::FileName iosToolPath() const;
 
     QStringList sdkTargets();
     void updateSimulators();