Change license of argparse.c back to LGPLv2.1
fa0ed1c7e2ee
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Change license of argparse.c back to LGPLv2.1

* common/argparse.c, common/argparse.h: Change license

On 2011-09-30 the license of these two files were changed from
LGPLv2.1 to LGPLv3+/GPLv2+. This was part of a general change from
files with either GPLv3+ or LGPv2.1+ to this combination so to allow
the use of these files with GPLv2only code.

Since then the code was only modified by employees of g10 Code GmbH
under my direction and myself. The following changes

commit 7249ab0f95d1f6cb8ee61eefedc79801bb56398f
Author:     Daniel Kahn Gillmor <dkg@fifthhorseman.net>
AuthorDate: Tue Jan 10 15:59:36 2017 -0500

commit eed16ccebf8fd1fdf9709affbd5c831f6957b8ae
Author:     Daniel Kahn Gillmor <dkg@fifthhorseman.net>
AuthorDate: Fri Nov 21 17:04:42 2014 -0500

and a few typo fixes are minor and thus not copyright-able.