Import and relicense exechelp* functions from GnuPG.
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Description

Import and relicense exechelp* functions from GnuPG.

* src/spawn-posix.c: New.  Taken from GnuPG's exechelp-posix.c.
* src/spawn-w32.c: New.  Taken from GnuPG's exechelp-w32.c.
* src/gpgrt-int.h: Include prototypes from GnuPG's exechelp.h.

The original files were under (LGPL-3.0+ OR GPL-2.0+) and have
entirely been written by g10 Code employees. Being the responsible
person at g10 Code, I endorse the license change to LGPL-2.1.