Merge the multiple implementations of getting the local hostname

This commit moves the functionality from QtNetwork's QHostInfo to
QtCore. Note that due to Windows ws2_32.dll's quirky behavior of
requiring WSAStartup before calling gethostname, this change required
moving the initialization to QtCore too.

On Linux systems, gethostname() gets the name from uname(), so we bypass
the middle man and save one memcpy.

Change-Id: I27eaacb532114dd188c4ffff13d32655a6301346
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

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