Add COPYING files for imported code

Add COPYING files for imported code

Code for debugedit has been imported that was derived from binutils,
libiberty and rpm some use different licenses, but all are upward
compatible with GPLv3+.

COPYING (GPLv2+) covers scripts/find-debuginfo.sh, all files under
tests, tools/hashtab.h, tools/sha1.c, tools/md5.{c,h},
tools/ansidecl.h and tools/debugedit.c.

COPYING3 (GPLv3+) covers tools/sepdebugcrcfix.c and tools/sha1.h

COPYING.LIB (LGPLv2+) covers tools/hashtab.c.