Since commit 7ced0732 (make default install component name configurable,
2012-05-13) the COMPONENT option has not worked in all cases. The
change restored use of the broken SetDefaultString previously removed by
commit 43cad3e4 (fix the default "Unspecified" component, 2008-03-26).
Remove SetDefaultString and use the default component name only when an
invocation does not specify a non-empty COMPONENT option value.
Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=680825
This converts the CMake license to a pure 3-clause OSI-approved BSD
License. We drop the previous license clause requiring modified
versions to be plainly marked. We also update the CMake copyright to
cover the full development time range.