Include major version number in library names

Include major version number in library names

Currently it is not possible to cleanly install multiple major version
of FreeRDP concurrently as some of the development libraries (.so files)
files can conflict.

This change renames all libraries to include the major version number in
the library name to fix this limitation.

The list of changed libraries:

libwinpr-tools.so -> libwinpr-tools2.so
libwinpr.so -> libwinpr2.so
libfreerdp.so -> libfreerdp2.so
libfreerdp-client.so -> libfreerdp-client2.so
libfreerdp-shadow.so -> libfreerdp-shadow2.so
libfreerdp-server.so ->  libfreerdp-server2.so
libfreerdp-shadow-subsystem.so -> libfreerdp-shadow-subsystem2.so
libuwac.so -> libuwac0.so

As the library names have changed, projects that use FreeRDP will need to
update their dependencies. -
If pkg-config or cmake find modules are used, reconfiguration might be
sufficient.

Fixes #3460