File README.source of Package owncloud-client

The original tarball from upstream was repackaged to 
a tarball named owncloudclient_os-%{version}.

Some useless files were removed which are not neccessary to build
the linux version of the client and which bring in questionable

In particular, the owncloudclient_os tarball was created by 

rm -rf binary/ 
rm -rf src/3rdparty/libcrashreporter-qt 
rm -rf shell_integration/windows 
rm -rf shell_integration/MacOSX 
rm -rf src/3rdparty/libcrashreporter-qt/3rdparty/breakpad/common/convert_UTF.*

Apart from that, the tarball is unchanged compared to the upstream one.

See discussion in for details.

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