Do not install the schema of the gsettings example

* examples/Makefile.am: Do not install the schema file of the settings
example to the user's system.  Instead, compile the binary shema cache
in a local directory and have the example use that.  As a side effect,
this also resolves the "make distcheck" failure when trying to install
the schema.
* examples/settings/settings.cc (main): Do not try to determine the
schema directory from the executable name, as it depends too much on
the libtool setup with the hidden .libs directory being part of the
path name.  Requiring the user to change to the example directory is
good enough.  Also, initialize the C++ locale on program startup, and
call Gio::init() instead of Glib::init().
(on_key_changed): Call ustring::raw() to suppress the locale-aware
comparison ustring performs by default.

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