Update the GPL version 2 text to the current text as published at
https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
The changes are
* the updated mailing address of the FSF
* reference to LGPL with name change ("Library" -> "Lesser")
* whitespace formatting
* "write to" new FSF address to get a copy of the license
instead of "seeing http://www.gnu.org/licenses/"