Updated to version 3.0u.

Pkgsrc changes:
  - Updated HOMEPAGE. Changes were collected from this page.
  - Needs GNU make.
  - LICENSE is GPLv2
  - Added basic support for "make test".

Changes since version 3.0q:
===========================
Xdelta-3.0u release notes:

    * New xdelta3 merge command (issue 36)
    * Windows stdin/stdout-related fixes (issue 34)
    * Fix API-only infinite loop (issue 70)
    * Various portability and build fixes (gcc4, DJGPP, MinGW, Big-endian,
      Solaris, C++)
    * New regression test (yeah!)

Xdelta-3.0t release notes:

    * Improves compression by avoiding inefficient small copies (e.g.,
      copies of length 4 at a distance >= 2^14 are skipped)
    * Fixes an uninitialized array element in -S djw which did not cause
      a crash, but caused less than ideal compression and test failures
    * Fixes bugs in xdelta3 recode, tests added
    * All tests pass under Valgrind

Xdelta-3.0s release notes:

    * Faster! Several optimizations to avoid unnecessary arithmetic
    * xdelta3 -1 has faster/poorer compression (xdelta3 -2 is the former
      configuration)
    * -S djw exposes secondary compression levels as -S djw1 .. -S djw9
    * Removes "source file too large for external decompression" error check
    * API support for transcoding other formats into VCDIFF

Xdelta-3.0r release notes:

    * Fixes an encoder crash caused by -S djw (secondary compressor) on
      certain data, new tests for code-length overflow
    * Adds new recode command for re-encoding a delta with different
      secondary compression settings
    * Fixes API-specific bugs related to non-blocking calls to
      xd3_encode_input and xd3_decode_input
    * Adds new examples/encoder_decoder_test.c program for the non-blocking API

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