Add license files mandated by (L)GPL.

Add license files mandated by (L)GPL.

Currently only qtbase includes the required LICENSE files, which
are referred to from the code headers. The same files should
be distributed as part of all the modules as well, so that the
(L)GPL licenses are adhered.

These files were wget:d from:

https://qt.gitorious.org/qt/qtbase/blobs/raw/stable/LGPL_EXCEPTION.txt
https://qt.gitorious.org/qt/qtbase/blobs/raw/stable/LICENSE.LGPL
https://qt.gitorious.org/qt/qtbase/blobs/raw/stable/LICENSE.GPL

As an addition to above, added also LICENSE.FDL. All the modules
additionally require it, since they include at least *.qdoc files and in
some cases a couple of others.

File received via
wget http://qt.gitorious.org/qt/qtbase/blobs/raw/stable/LICENSE.FDL

Change-Id: I39ae1b6beee8d626855a747fdf8d794e6574313b
Reviewed-by: Jason McDonald <macadder1@gmail.com>