all: update LZMA SDK license information

The LZMA SDK was placed in the public domain as of
version 4.62 (December 2008).

  https://www.7-zip.org/sdk.html

And according to https://sourceforge.net/p/sevenzip/discussion/45797/thread/685169cf/

  "Are older LZMA versions in the public domain?"
  "Yes, you can use old versions of LZMA SDK as public domain."
    -- Igor Pavlov, 2011-06-21

src/compress/compress_lzma.cpp

@@ -50,41 +50,15 @@ void lzma_compress_config_t::reset() noexcept {
     max_num_probs = 0;
 }
 
-// INFO: the LZMA SDK is covered by a permissive license which allows
+// INFO: LZMA SDK is placed in the public domain.
-//   using unmodified LZMA source code in UPX and the UPX stubs.
-//   See SPECIAL EXCEPTION below.
 //
-// Quoting from lzma-4.43/lzma.txt:
+// Anyone is free to copy, modify, publish, use, compile, sell, or
+// distribute the original LZMA SDK code, either in source code form
+// or as a compiled binary, for any purpose, commercial or non-commercial,
+// and by any means.
 //
-//   LICENSE
+// https://www.7-zip.org/sdk.html
-//   -------
+// https://sourceforge.net/p/sevenzip/discussion/45797/thread/685169cf/
-//
-//   LZMA SDK is available under any of the following licenses:
-//
-//   1) GNU Lesser General Public License (GNU LGPL)
-//   2) Common Public License (CPL)
-//   3) Simplified license for unmodified code (read SPECIAL EXCEPTION)
-//   4) Proprietary license
-//
-//   It means that you can select one of these four options and follow rules
-//   of that license.
-//
-//   1,2) GNU LGPL and CPL licenses are pretty similar and both these
-//   licenses are classified as
-//    - "Free software licenses" at http://www.gnu.org/
-//    - "OSI-approved" at http://www.opensource.org/
-//
-//   3) SPECIAL EXCEPTION
-//
-//   Igor Pavlov, as the author of this code, expressly permits you
-//   to statically or dynamically link your code (or bind by name)
-//   to the files from LZMA SDK without subjecting your linked
-//   code to the terms of the CPL or GNU LGPL.
-//   Any modifications or additions to files from LZMA SDK, however,
-//   are subject to the GNU LGPL or CPL terms.
-//
-//   SPECIAL EXCEPTION allows you to use LZMA SDK in applications with closed code,
-//   while you keep LZMA SDK code unmodified.
 
 /*************************************************************************
 // compress defaults

src/help.cpp

@@ -471,7 +471,7 @@ void show_version(bool one_line) {
     fprintf(f, "Copyright (C) 1995" "-2024 Jean-loup Gailly and Mark Adler\n");
 #endif
 #if (WITH_LZMA)
-    // see vendor/lzma-sdk/lzma.txt
+    // see vendor/lzma-sdk
     fprintf(f, "Copyright (C) 1999" "-2006 Igor Pavlov\n");
 #endif
 #if (WITH_ZSTD)